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\left(x+4\right)\left(x-1\right)+\left(x+7\right)\left(x+6\right)=2\left(x+4\right)\left(x+7\right)
Variable x cannot be equal to any of the values -7,-4 since division by zero is not defined. Multiply both sides of the equation by \left(x+4\right)\left(x+7\right), the least common multiple of x+7,x+4.
x^{2}+3x-4+\left(x+7\right)\left(x+6\right)=2\left(x+4\right)\left(x+7\right)
Use the distributive property to multiply x+4 by x-1 and combine like terms.
x^{2}+3x-4+x^{2}+13x+42=2\left(x+4\right)\left(x+7\right)
Use the distributive property to multiply x+7 by x+6 and combine like terms.
2x^{2}+3x-4+13x+42=2\left(x+4\right)\left(x+7\right)
Combine x^{2} and x^{2} to get 2x^{2}.
2x^{2}+16x-4+42=2\left(x+4\right)\left(x+7\right)
Combine 3x and 13x to get 16x.
2x^{2}+16x+38=2\left(x+4\right)\left(x+7\right)
Add -4 and 42 to get 38.
2x^{2}+16x+38=\left(2x+8\right)\left(x+7\right)
Use the distributive property to multiply 2 by x+4.
2x^{2}+16x+38=2x^{2}+22x+56
Use the distributive property to multiply 2x+8 by x+7 and combine like terms.
2x^{2}+16x+38-2x^{2}=22x+56
Subtract 2x^{2} from both sides.
16x+38=22x+56
Combine 2x^{2} and -2x^{2} to get 0.
16x+38-22x=56
Subtract 22x from both sides.
-6x+38=56
Combine 16x and -22x to get -6x.
-6x=56-38
Subtract 38 from both sides.
-6x=18
Subtract 38 from 56 to get 18.
x=\frac{18}{-6}
Divide both sides by -6.
x=-3
Divide 18 by -6 to get -3.