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-5x+3(2x+12)=31
We move all terms to the left:
-5x+3(2x+12)-(31)=0
We multiply parentheses
-5x+6x+36-31=0
We add all the numbers together, and all the variables
x+5=0
We move all terms containing x to the left, all other terms to the right
x=-5
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