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x-\left(3-2x-8\right)=-7
Use the distributive property to multiply -2 by x+4.
x-\left(-5-2x\right)=-7
Subtract 8 from 3 to get -5.
x-\left(-5\right)-\left(-2x\right)=-7
To find the opposite of -5-2x, find the opposite of each term.
x+5-\left(-2x\right)=-7
The opposite of -5 is 5.
x+5+2x=-7
The opposite of -2x is 2x.
3x+5=-7
Combine x and 2x to get 3x.
3x=-7-5
Subtract 5 from both sides.
3x=-12
Subtract 5 from -7 to get -12.
x=\frac{-12}{3}
Divide both sides by 3.
x=-4
Divide -12 by 3 to get -4.