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7x-5(x+12)=12
We move all terms to the left:
7x-5(x+12)-(12)=0
We multiply parentheses
7x-5x-60-12=0
We add all the numbers together, and all the variables
2x-72=0
We move all terms containing x to the left, all other terms to the right
2x=72
x=72/2
x=36
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