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4x+x-15+3-18x=13
We move all terms to the left:
4x+x-15+3-18x-(13)=0
We add all the numbers together, and all the variables
-13x-25=0
We move all terms containing x to the left, all other terms to the right
-13x=25
x=25/-13
x=-1+12/13
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