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\left(2x+5\right)\left(4x-8\right)=\left(x-5\right)\times 8x
Variable x cannot be equal to any of the values -\frac{5}{2},5 since division by zero is not defined. Multiply both sides of the equation by \left(x-5\right)\left(2x+5\right), the least common multiple of x-5,2x+5.
8x^{2}+4x-40=\left(x-5\right)\times 8x
Use the distributive property to multiply 2x+5 by 4x-8 and combine like terms.
8x^{2}+4x-40=\left(8x-40\right)x
Use the distributive property to multiply x-5 by 8.
8x^{2}+4x-40=8x^{2}-40x
Use the distributive property to multiply 8x-40 by x.
8x^{2}+4x-40-8x^{2}=-40x
Subtract 8x^{2} from both sides.
4x-40=-40x
Combine 8x^{2} and -8x^{2} to get 0.
4x-40+40x=0
Add 40x to both sides.
44x-40=0
Combine 4x and 40x to get 44x.
44x=40
Add 40 to both sides. Anything plus zero gives itself.
x=\frac{40}{44}
Divide both sides by 44.
x=\frac{10}{11}
Reduce the fraction \frac{40}{44} to lowest terms by extracting and canceling out 4.