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0.04x-0.9x=15.6
We move all terms to the left:
0.04x-0.9x-(15.6)=0
We add all the numbers together, and all the variables
-0.86x-15.6=0
We move all terms containing x to the left, all other terms to the right
-0.86x=15.6
x=15.6/-0.86
x=-18+0.12/0.86
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