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0.20x+0.25*70=35.5
We move all terms to the left:
0.20x+0.25*70-(35.5)=0
We add all the numbers together, and all the variables
0.20x-18=0
We move all terms containing x to the left, all other terms to the right
0.20x=18
x=18/0.20
x=90
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