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-7.5x=42.5
We move all terms to the left:
-7.5x-(42.5)=0
We add all the numbers together, and all the variables
-7.5x-42.5=0
We move all terms containing x to the left, all other terms to the right
-7.5x=42.5
x=42.5/-7.5
x=-5+5/7.5
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