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7.5=x-12.25
We move all terms to the left:
7.5-(x-12.25)=0
We get rid of parentheses
-x+12.25+7.5=0
We add all the numbers together, and all the variables
-1x+19.75=0
We move all terms containing x to the left, all other terms to the right
-x=-19.75
x=-19.75/-1
x=19+0.75/1
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