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-7.5=1.25x+2.5
We move all terms to the left:
-7.5-(1.25x+2.5)=0
We get rid of parentheses
-1.25x-2.5-7.5=0
We add all the numbers together, and all the variables
-1.25x-10=0
We move all terms containing x to the left, all other terms to the right
-1.25x=10
x=10/-1.25
x=-8
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