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0.04x+0.18=13
We move all terms to the left:
0.04x+0.18-(13)=0
We add all the numbers together, and all the variables
0.04x-12.82=0
We move all terms containing x to the left, all other terms to the right
0.04x=12.82
x=12.82/0.04
x=320+0.02/0.04
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