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36x+36-7\left(2x-4\right)=2x-76
Use the distributive property to multiply 12 by 3x+3.
36x+36-14x+28=2x-76
Use the distributive property to multiply -7 by 2x-4.
22x+36+28=2x-76
Combine 36x and -14x to get 22x.
22x+64=2x-76
Add 36 and 28 to get 64.
22x+64-2x=-76
Subtract 2x from both sides.
20x+64=-76
Combine 22x and -2x to get 20x.
20x=-76-64
Subtract 64 from both sides.
20x=-140
Subtract 64 from -76 to get -140.
x=\frac{-140}{20}
Divide both sides by 20.
x=-7
Divide -140 by 20 to get -7.