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x+39=2x-10
We move all terms to the left:
x+39-(2x-10)=0
We get rid of parentheses
x-2x+10+39=0
We add all the numbers together, and all the variables
-1x+49=0
We move all terms containing x to the left, all other terms to the right
-x=-49
x=-49/-1
x=+49
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