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\left(x+2\right)\left(x+6\right)-\left(3x^{2}+10x+4\right)+\left(x+1\right)\left(2x+1\right)=0
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 \left(x+1\right)\left(x+2\right), the least common multiple of x+1,x^{2}+3x+2,x+2.
x^{2}+8x+12-\left(3x^{2}+10x+4\right)+\left(x+1\right)\left(2x+1\right)=0
Use the distributive property to multiply x+2 by x+6 and combine like terms.
x^{2}+8x+12-3x^{2}-10x-4+\left(x+1\right)\left(2x+1\right)=0
To find the opposite of 3x^{2}+10x+4, find the opposite of each term.
-2x^{2}+8x+12-10x-4+\left(x+1\right)\left(2x+1\right)=0
Combine x^{2} and -3x^{2} to get -2x^{2}.
-2x^{2}-2x+12-4+\left(x+1\right)\left(2x+1\right)=0
Combine 8x and -10x to get -2x.
-2x^{2}-2x+8+\left(x+1\right)\left(2x+1\right)=0
Subtract 4 from 12 to get 8.
-2x^{2}-2x+8+2x^{2}+3x+1=0
Use the distributive property to multiply x+1 by 2x+1 and combine like terms.
-2x+8+3x+1=0
Combine -2x^{2} and 2x^{2} to get 0.
x+8+1=0
Combine -2x and 3x to get x.
x+9=0
Add 8 and 1 to get 9.
x=-9
Subtract 9 from both sides. Anything subtracted from zero gives its negation.