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8x=\left(x-4\right)\times 4-\left(x+1\right)\times 8
Variable x cannot be equal to any of the values -1,4 since division by zero is not defined. Multiply both sides of the equation by \left(x-4\right)\left(x+1\right), the least common multiple of x^{2}-3x-4,x+1,x-4.
8x=4x-16-\left(x+1\right)\times 8
Use the distributive property to multiply x-4 by 4.
8x=4x-16-\left(8x+8\right)
Use the distributive property to multiply x+1 by 8.
8x=4x-16-8x-8
To find the opposite of 8x+8, find the opposite of each term.
8x=-4x-16-8
Combine 4x and -8x to get -4x.
8x=-4x-24
Subtract 8 from -16 to get -24.
8x+4x=-24
Add 4x to both sides.
12x=-24
Combine 8x and 4x to get 12x.
x=\frac{-24}{12}
Divide both sides by 12.
x=-2
Divide -24 by 12 to get -2.