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3x-13=-2x-18
We move all terms to the left:
3x-13-(-2x-18)=0
We get rid of parentheses
3x+2x+18-13=0
We add all the numbers together, and all the variables
5x+5=0
We move all terms containing x to the left, all other terms to the right
5x=-5
x=-5/5
x=-1
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