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x+15-10=-3x-15
We move all terms to the left:
x+15-10-(-3x-15)=0
We add all the numbers together, and all the variables
x-(-3x-15)+5=0
We get rid of parentheses
x+3x+15+5=0
We add all the numbers together, and all the variables
4x+20=0
We move all terms containing x to the left, all other terms to the right
4x=-20
x=-20/4
x=-5
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