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-13x+20=-18x-15
We move all terms to the left:
-13x+20-(-18x-15)=0
We get rid of parentheses
-13x+18x+15+20=0
We add all the numbers together, and all the variables
5x+35=0
We move all terms containing x to the left, all other terms to the right
5x=-35
x=-35/5
x=-7
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