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x+10=-20+3x
We move all terms to the left:
x+10-(-20+3x)=0
We add all the numbers together, and all the variables
x-(3x-20)+10=0
We get rid of parentheses
x-3x+20+10=0
We add all the numbers together, and all the variables
-2x+30=0
We move all terms containing x to the left, all other terms to the right
-2x=-30
x=-30/-2
x=+15
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