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(3x+5)-x+12=77
We move all terms to the left:
(3x+5)-x+12-(77)=0
We add all the numbers together, and all the variables
-1x+(3x+5)-65=0
We get rid of parentheses
-1x+3x+5-65=0
We add all the numbers together, and all the variables
2x-60=0
We move all terms containing x to the left, all other terms to the right
2x=60
x=60/2
x=30
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