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2x\left(x^{3}-1\right)+\left(5x^{2}-1\right)\left(x-3\right)+12x^{2}=4x^{2}\left(\frac{1}{2}x-\frac{1}{4}\right)\left(x+3\right)
Multiply both sides of the equation by 4, the least common multiple of 2,4.
2x^{4}-2x+\left(5x^{2}-1\right)\left(x-3\right)+12x^{2}=4x^{2}\left(\frac{1}{2}x-\frac{1}{4}\right)\left(x+3\right)
Use the distributive property to multiply 2x by x^{3}-1.
2x^{4}-2x+5x^{3}-15x^{2}-x+3+12x^{2}=4x^{2}\left(\frac{1}{2}x-\frac{1}{4}\right)\left(x+3\right)
Use the distributive property to multiply 5x^{2}-1 by x-3.
2x^{4}-3x+5x^{3}-15x^{2}+3+12x^{2}=4x^{2}\left(\frac{1}{2}x-\frac{1}{4}\right)\left(x+3\right)
Combine -2x and -x to get -3x.
2x^{4}-3x+5x^{3}-3x^{2}+3=4x^{2}\left(\frac{1}{2}x-\frac{1}{4}\right)\left(x+3\right)
Combine -15x^{2} and 12x^{2} to get -3x^{2}.
2x^{4}-3x+5x^{3}-3x^{2}+3=\left(2x^{3}-x^{2}\right)\left(x+3\right)
Use the distributive property to multiply 4x^{2} by \frac{1}{2}x-\frac{1}{4}.
2x^{4}-3x+5x^{3}-3x^{2}+3=2x^{4}+5x^{3}-3x^{2}
Use the distributive property to multiply 2x^{3}-x^{2} by x+3 and combine like terms.
2x^{4}-3x+5x^{3}-3x^{2}+3-2x^{4}=5x^{3}-3x^{2}
Subtract 2x^{4} from both sides.
-3x+5x^{3}-3x^{2}+3=5x^{3}-3x^{2}
Combine 2x^{4} and -2x^{4} to get 0.
-3x+5x^{3}-3x^{2}+3-5x^{3}=-3x^{2}
Subtract 5x^{3} from both sides.
-3x-3x^{2}+3=-3x^{2}
Combine 5x^{3} and -5x^{3} to get 0.
-3x-3x^{2}+3+3x^{2}=0
Add 3x^{2} to both sides.
-3x+3=0
Combine -3x^{2} and 3x^{2} to get 0.
-3x=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-3}{-3}
Divide both sides by -3.
x=1
Divide -3 by -3 to get 1.