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13x+18=3x+278
We move all terms to the left:
13x+18-(3x+278)=0
We get rid of parentheses
13x-3x-278+18=0
We add all the numbers together, and all the variables
10x-260=0
We move all terms containing x to the left, all other terms to the right
10x=260
x=260/10
x=26
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