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7x-3(x+5)=12
We move all terms to the left:
7x-3(x+5)-(12)=0
We multiply parentheses
7x-3x-15-12=0
We add all the numbers together, and all the variables
4x-27=0
We move all terms containing x to the left, all other terms to the right
4x=27
x=27/4
x=6+3/4
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