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13=x/7.68+7
We move all terms to the left:
13-(x/7.68+7)=0
We get rid of parentheses
-x/7.68-7+13=0
We multiply all the terms by the denominator
-x-7*7.68+13*7.68=0
We add all the numbers together, and all the variables
-1x+46.08=0
We move all terms containing x to the left, all other terms to the right
-x=-46.08
x=-46.08/-1
x=46+0.079999999999998/1
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