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50=4x-12
We move all terms to the left:
50-(4x-12)=0
We get rid of parentheses
-4x+12+50=0
We add all the numbers together, and all the variables
-4x+62=0
We move all terms containing x to the left, all other terms to the right
-4x=-62
x=-62/-4
x=15+1/2
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