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