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69.9=x+0.08x
We move all terms to the left:
69.9-(x+0.08x)=0
We add all the numbers together, and all the variables
-(+1.08x)+69.9=0
We get rid of parentheses
-1.08x+69.9=0
We move all terms containing x to the left, all other terms to the right
-1.08x=-69.9
x=-69.9/-1.08
x=64+0.78/1.08
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