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-17x+240=-15x
We move all terms to the left:
-17x+240-(-15x)=0
We get rid of parentheses
-17x+15x+240=0
We add all the numbers together, and all the variables
-2x+240=0
We move all terms containing x to the left, all other terms to the right
-2x=-240
x=-240/-2
x=+120
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