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17=x+2=-x+40
We move all terms to the left:
17-(x+2)=0
We get rid of parentheses
-x-2+17=0
We add all the numbers together, and all the variables
-1x+15=0
We move all terms containing x to the left, all other terms to the right
-x=-15
x=-15/-1
x=+15
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