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x+5+12=3x+3
We move all terms to the left:
x+5+12-(3x+3)=0
We add all the numbers together, and all the variables
x-(3x+3)+17=0
We get rid of parentheses
x-3x-3+17=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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