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(-3x)-5=13
We move all terms to the left:
(-3x)-5-(13)=0
We add all the numbers together, and all the variables
(-3x)-18=0
We get rid of parentheses
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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