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126=3x+78
We move all terms to the left:
126-(3x+78)=0
We get rid of parentheses
-3x-78+126=0
We add all the numbers together, and all the variables
-3x+48=0
We move all terms containing x to the left, all other terms to the right
-3x=-48
x=-48/-3
x=+16
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