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-17=-42+x
We move all terms to the left:
-17-(-42+x)=0
We add all the numbers together, and all the variables
-(x-42)-17=0
We get rid of parentheses
-x+42-17=0
We add all the numbers together, and all the variables
-1x+25=0
We move all terms containing x to the left, all other terms to the right
-x=-25
x=-25/-1
x=+25
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