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60+0.70x=40=0.80
We move all terms to the left:
60+0.70x-(40)=0
We add all the numbers together, and all the variables
0.70x+20=0
We move all terms containing x to the left, all other terms to the right
0.70x=-20
x=-20/0.70
x=-28+0.4/0.70
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