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12x-13=19x+50
We move all terms to the left:
12x-13-(19x+50)=0
We get rid of parentheses
12x-19x-50-13=0
We add all the numbers together, and all the variables
-7x-63=0
We move all terms containing x to the left, all other terms to the right
-7x=63
x=63/-7
x=-9
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