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10-2.5x=x+7.5
We move all terms to the left:
10-2.5x-(x+7.5)=0
We get rid of parentheses
-2.5x-x-7.5+10=0
We add all the numbers together, and all the variables
-3.5x+2.5=0
We move all terms containing x to the left, all other terms to the right
-3.5x=-2.5
x=-2.5/-3.5
x=2.5/3.5
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