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0.80x+0.20(170)=0.40(79)
We move all terms to the left:
0.80x+0.20(170)-(0.40(79))=0
We add all the numbers together, and all the variables
0.80x-0.2062=0
We move all terms containing x to the left, all other terms to the right
0.80x=0.2062
x=0.2062/0.80
x=0.2062/0.80
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