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72.5=-4+8.5x
We move all terms to the left:
72.5-(-4+8.5x)=0
We add all the numbers together, and all the variables
-(8.5x-4)+72.5=0
We get rid of parentheses
-8.5x+4+72.5=0
We add all the numbers together, and all the variables
-8.5x+76.5=0
We move all terms containing x to the left, all other terms to the right
-8.5x=-76.5
x=-76.5/-8.5
x=+9
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