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x+.10x=19.80
We move all terms to the left:
x+.10x-(19.80)=0
We add all the numbers together, and all the variables
x+.10x-(19.8)=0
We add all the numbers together, and all the variables
1.1x-19.8=0
We move all terms containing x to the left, all other terms to the right
1.1x=19.8
x=19.8/1.1
x=18
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