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-15x-105=5x-85
We move all terms to the left:
-15x-105-(5x-85)=0
We get rid of parentheses
-15x-5x+85-105=0
We add all the numbers together, and all the variables
-20x-20=0
We move all terms containing x to the left, all other terms to the right
-20x=20
x=20/-20
x=-1
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