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7x-5(3x+12)=28
We move all terms to the left:
7x-5(3x+12)-(28)=0
We multiply parentheses
7x-15x-60-28=0
We add all the numbers together, and all the variables
-8x-88=0
We move all terms containing x to the left, all other terms to the right
-8x=88
x=88/-8
x=-11
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