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2x+1(39)=3x+13
We move all terms to the left:
2x+1(39)-(3x+13)=0
We get rid of parentheses
2x-3x-13+139=0
We add all the numbers together, and all the variables
-1x+126=0
We move all terms containing x to the left, all other terms to the right
-x=-126
x=-126/-1
x=+126
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