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-19x=12x-155
We move all terms to the left:
-19x-(12x-155)=0
We get rid of parentheses
-19x-12x+155=0
We add all the numbers together, and all the variables
-31x+155=0
We move all terms containing x to the left, all other terms to the right
-31x=-155
x=-155/-31
x=+5
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