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x+0.18x=12420
We move all terms to the left:
x+0.18x-(12420)=0
We add all the numbers together, and all the variables
1.18x-12420=0
We move all terms containing x to the left, all other terms to the right
1.18x=12420
x=12420/1.18
x=10525+0.5/1.18
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