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50=9x-1+12x+13
We move all terms to the left:
50-(9x-1+12x+13)=0
We add all the numbers together, and all the variables
-(21x+12)+50=0
We get rid of parentheses
-21x-12+50=0
We add all the numbers together, and all the variables
-21x+38=0
We move all terms containing x to the left, all other terms to the right
-21x=-38
x=-38/-21
x=1+17/21
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