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3x+18=13x-83x=
We move all terms to the left:
3x+18-(13x-83x)=0
We add all the numbers together, and all the variables
3x-(-70x)+18=0
We get rid of parentheses
3x+70x+18=0
We add all the numbers together, and all the variables
73x+18=0
We move all terms containing x to the left, all other terms to the right
73x=-18
x=-18/73
x=-18/73
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