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x+10=-3x-10
We move all terms to the left:
x+10-(-3x-10)=0
We get rid of parentheses
x+3x+10+10=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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