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x+0.12x=13500
We move all terms to the left:
x+0.12x-(13500)=0
We add all the numbers together, and all the variables
1.12x-13500=0
We move all terms containing x to the left, all other terms to the right
1.12x=13500
x=13500/1.12
x=12053+0.639999999999/1.12
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