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10.25x+680=12.5x+140
We move all terms to the left:
10.25x+680-(12.5x+140)=0
We get rid of parentheses
10.25x-12.5x-140+680=0
We add all the numbers together, and all the variables
-2.25x+540=0
We move all terms containing x to the left, all other terms to the right
-2.25x=-540
x=-540/-2.25
x=+240
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