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