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x-(0.10x)=12
We move all terms to the left:
x-(0.10x)-(12)=0
We add all the numbers together, and all the variables
x-(+0.10x)-12=0
We get rid of parentheses
x-0.10x-12=0
We add all the numbers together, and all the variables
0.9x-12=0
We move all terms containing x to the left, all other terms to the right
0.9x=12
x=12/0.9
x=13+0.3/0.9
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