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3+6x^{2}-8x=4x\left(2x-5\right)-2x\left(x-1\right)
Use the distributive property to multiply 2x by 3x-4.
3+6x^{2}-8x=8x^{2}-20x-2x\left(x-1\right)
Use the distributive property to multiply 4x by 2x-5.
3+6x^{2}-8x+2x\left(x-1\right)=8x^{2}-20x
Add 2x\left(x-1\right) to both sides.
3+6x^{2}-8x+2x^{2}-2x=8x^{2}-20x
Use the distributive property to multiply 2x by x-1.
3+8x^{2}-8x-2x=8x^{2}-20x
Combine 6x^{2} and 2x^{2} to get 8x^{2}.
3+8x^{2}-10x=8x^{2}-20x
Combine -8x and -2x to get -10x.
3+8x^{2}-10x-8x^{2}=-20x
Subtract 8x^{2} from both sides.
3-10x=-20x
Combine 8x^{2} and -8x^{2} to get 0.
3-10x+20x=0
Add 20x to both sides.
3+10x=0
Combine -10x and 20x to get 10x.
10x=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-3}{10}
Divide both sides by 10.
x=-\frac{3}{10}
Fraction \frac{-3}{10} can be rewritten as -\frac{3}{10} by extracting the negative sign.