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\left(x-7\right)\times 3x+\left(x+2\right)\times 2x=\left(x-7\right)\left(5x+6\right)
Variable x cannot be equal to any of the values -2,7 since division by zero is not defined. Multiply both sides of the equation by \left(x-7\right)\left(x+2\right), the least common multiple of x+2,x-7.
\left(3x-21\right)x+\left(x+2\right)\times 2x=\left(x-7\right)\left(5x+6\right)
Use the distributive property to multiply x-7 by 3.
3x^{2}-21x+\left(x+2\right)\times 2x=\left(x-7\right)\left(5x+6\right)
Use the distributive property to multiply 3x-21 by x.
3x^{2}-21x+\left(2x+4\right)x=\left(x-7\right)\left(5x+6\right)
Use the distributive property to multiply x+2 by 2.
3x^{2}-21x+2x^{2}+4x=\left(x-7\right)\left(5x+6\right)
Use the distributive property to multiply 2x+4 by x.
5x^{2}-21x+4x=\left(x-7\right)\left(5x+6\right)
Combine 3x^{2} and 2x^{2} to get 5x^{2}.
5x^{2}-17x=\left(x-7\right)\left(5x+6\right)
Combine -21x and 4x to get -17x.
5x^{2}-17x=5x^{2}-29x-42
Use the distributive property to multiply x-7 by 5x+6 and combine like terms.
5x^{2}-17x-5x^{2}=-29x-42
Subtract 5x^{2} from both sides.
-17x=-29x-42
Combine 5x^{2} and -5x^{2} to get 0.
-17x+29x=-42
Add 29x to both sides.
12x=-42
Combine -17x and 29x to get 12x.
x=\frac{-42}{12}
Divide both sides by 12.
x=-\frac{7}{2}
Reduce the fraction \frac{-42}{12} to lowest terms by extracting and canceling out 6.