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\left(3x+6\right)\left(x+5\right)-\left(3x+3\right)\left(2x+5\right)=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
Variable x cannot be equal to any of the values -2,-1 since division by zero is not defined. Multiply both sides of the equation by 3\left(x+1\right)\left(x+2\right), the least common multiple of x+1,x+2,3x+3,3x+6.
3x^{2}+21x+30-\left(3x+3\right)\left(2x+5\right)=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
Use the distributive property to multiply 3x+6 by x+5 and combine like terms.
3x^{2}+21x+30-\left(6x^{2}+21x+15\right)=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
Use the distributive property to multiply 3x+3 by 2x+5 and combine like terms.
3x^{2}+21x+30-6x^{2}-21x-15=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
To find the opposite of 6x^{2}+21x+15, find the opposite of each term.
-3x^{2}+21x+30-21x-15=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
Combine 3x^{2} and -6x^{2} to get -3x^{2}.
-3x^{2}+30-15=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
Combine 21x and -21x to get 0.
-3x^{2}+15=\left(x+2\right)\left(x-5\right)-\left(x+1\right)\left(4x-3\right)
Subtract 15 from 30 to get 15.
-3x^{2}+15=x^{2}-3x-10-\left(x+1\right)\left(4x-3\right)
Use the distributive property to multiply x+2 by x-5 and combine like terms.
-3x^{2}+15=x^{2}-3x-10-\left(4x^{2}+x-3\right)
Use the distributive property to multiply x+1 by 4x-3 and combine like terms.
-3x^{2}+15=x^{2}-3x-10-4x^{2}-x+3
To find the opposite of 4x^{2}+x-3, find the opposite of each term.
-3x^{2}+15=-3x^{2}-3x-10-x+3
Combine x^{2} and -4x^{2} to get -3x^{2}.
-3x^{2}+15=-3x^{2}-4x-10+3
Combine -3x and -x to get -4x.
-3x^{2}+15=-3x^{2}-4x-7
Add -10 and 3 to get -7.
-3x^{2}+15+3x^{2}=-4x-7
Add 3x^{2} to both sides.
15=-4x-7
Combine -3x^{2} and 3x^{2} to get 0.
-4x-7=15
Swap sides so that all variable terms are on the left hand side.
-4x=15+7
Add 7 to both sides.
-4x=22
Add 15 and 7 to get 22.
x=\frac{22}{-4}
Divide both sides by -4.
x=-\frac{11}{2}
Reduce the fraction \frac{22}{-4} to lowest terms by extracting and canceling out 2.