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5x-18=12x-138
We move all terms to the left:
5x-18-(12x-138)=0
We get rid of parentheses
5x-12x+138-18=0
We add all the numbers together, and all the variables
-7x+120=0
We move all terms containing x to the left, all other terms to the right
-7x=-120
x=-120/-7
x=17+1/7
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