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2x+20+x+10=4x-10
We move all terms to the left:
2x+20+x+10-(4x-10)=0
We add all the numbers together, and all the variables
3x-(4x-10)+30=0
We get rid of parentheses
3x-4x+10+30=0
We add all the numbers together, and all the variables
-1x+40=0
We move all terms containing x to the left, all other terms to the right
-x=-40
x=-40/-1
x=+40
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