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12.5=x/2.2
We move all terms to the left:
12.5-(x/2.2)=0
We add all the numbers together, and all the variables
-(+x/2.2)+12.5=0
We get rid of parentheses
-x/2.2+12.5=0
We multiply all the terms by the denominator
-x+(12.5)*2.2=0
We add all the numbers together, and all the variables
-1x+27.5=0
We move all terms containing x to the left, all other terms to the right
-x=-27.5
x=-27.5/-1
x=27+0.5/1
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