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3x+20=-2x-10
We move all terms to the left:
3x+20-(-2x-10)=0
We get rid of parentheses
3x+2x+10+20=0
We add all the numbers together, and all the variables
5x+30=0
We move all terms containing x to the left, all other terms to the right
5x=-30
x=-30/5
x=-6
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