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-3=-5x-18
We move all terms to the left:
-3-(-5x-18)=0
We get rid of parentheses
5x+18-3=0
We add all the numbers together, and all the variables
5x+15=0
We move all terms containing x to the left, all other terms to the right
5x=-15
x=-15/5
x=-3
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