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50x+12=20x+102
We move all terms to the left:
50x+12-(20x+102)=0
We get rid of parentheses
50x-20x-102+12=0
We add all the numbers together, and all the variables
30x-90=0
We move all terms containing x to the left, all other terms to the right
30x=90
x=90/30
x=3
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