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30=x+0.08x+0.15x
We move all terms to the left:
30-(x+0.08x+0.15x)=0
We add all the numbers together, and all the variables
-(+1.23x)+30=0
We get rid of parentheses
-1.23x+30=0
We move all terms containing x to the left, all other terms to the right
-1.23x=-30
x=-30/-1.23
x=24+0.48/1.23
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