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12x+19=13x+7
We move all terms to the left:
12x+19-(13x+7)=0
We get rid of parentheses
12x-13x-7+19=0
We add all the numbers together, and all the variables
-1x+12=0
We move all terms containing x to the left, all other terms to the right
-x=-12
x=-12/-1
x=+12
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