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8x-(-23x)=240
We move all terms to the left:
8x-(-23x)-(240)=0
We get rid of parentheses
8x+23x-240=0
We add all the numbers together, and all the variables
31x-240=0
We move all terms containing x to the left, all other terms to the right
31x=240
x=240/31
x=7+23/31
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