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18-(-x)=25
We move all terms to the left:
18-(-x)-(25)=0
We add all the numbers together, and all the variables
-(-1x)+18-25=0
We add all the numbers together, and all the variables
-(-1x)-7=0
We get rid of parentheses
1x-7=0
We add all the numbers together, and all the variables
x-7=0
We move all terms containing x to the left, all other terms to the right
x=7
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