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15=x+0.06x+.15x
We move all terms to the left:
15-(x+0.06x+.15x)=0
We add all the numbers together, and all the variables
-(+1.21x)+15=0
We get rid of parentheses
-1.21x+15=0
We move all terms containing x to the left, all other terms to the right
-1.21x=-15
x=-15/-1.21
x=12+0.48/1.21
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