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8x+13=12x+50
We move all terms to the left:
8x+13-(12x+50)=0
We get rid of parentheses
8x-12x-50+13=0
We add all the numbers together, and all the variables
-4x-37=0
We move all terms containing x to the left, all other terms to the right
-4x=37
x=37/-4
x=-9+1/4
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