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8x-40=4\left(3x-3\right)
Use the distributive property to multiply 8 by x-5.
8x-40=12x-12
Use the distributive property to multiply 4 by 3x-3.
8x-40-12x=-12
Subtract 12x from both sides.
-4x-40=-12
Combine 8x and -12x to get -4x.
-4x=-12+40
Add 40 to both sides.
-4x=28
Add -12 and 40 to get 28.
x=\frac{28}{-4}
Divide both sides by -4.
x=-7
Divide 28 by -4 to get -7.