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12=x/2.5
We move all terms to the left:
12-(x/2.5)=0
We add all the numbers together, and all the variables
-(+x/2.5)+12=0
We get rid of parentheses
-x/2.5+12=0
We multiply all the terms by the denominator
-x+12*2.5=0
We add all the numbers together, and all the variables
-1x+30=0
We move all terms containing x to the left, all other terms to the right
-x=-30
x=-30/-1
x=+30
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