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3x+10+3x+10=x-30+x-30
We move all terms to the left:
3x+10+3x+10-(x-30+x-30)=0
We add all the numbers together, and all the variables
3x+3x-(2x-60)+10+10=0
We add all the numbers together, and all the variables
6x-(2x-60)+20=0
We get rid of parentheses
6x-2x+60+20=0
We add all the numbers together, and all the variables
4x+80=0
We move all terms containing x to the left, all other terms to the right
4x=-80
x=-80/4
x=-20
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