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x+x*0.18=80
We move all terms to the left:
x+x*0.18-(80)=0
Wy multiply elements
x+0.18x-80=0
We add all the numbers together, and all the variables
1.18x-80=0
We move all terms containing x to the left, all other terms to the right
1.18x=80
x=80/1.18
x=67+0.94/1.18
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