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15=x/20.48+7
We move all terms to the left:
15-(x/20.48+7)=0
We get rid of parentheses
-x/20.48-7+15=0
We multiply all the terms by the denominator
-x-7*20.48+15*20.48=0
We add all the numbers together, and all the variables
-1x+163.84=0
We move all terms containing x to the left, all other terms to the right
-x=-163.84
x=-163.84/-1
x=163+0.84/1
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