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15=-85-25x
We move all terms to the left:
15-(-85-25x)=0
We add all the numbers together, and all the variables
-(-25x-85)+15=0
We get rid of parentheses
25x+85+15=0
We add all the numbers together, and all the variables
25x+100=0
We move all terms containing x to the left, all other terms to the right
25x=-100
x=-100/25
x=-4
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