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80+0.50x=20+0.80x
We move all terms to the left:
80+0.50x-(20+0.80x)=0
We add all the numbers together, and all the variables
0.50x-(0.80x+20)+80=0
We get rid of parentheses
0.50x-0.80x-20+80=0
We add all the numbers together, and all the variables
-0.3x+60=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-60
x=-60/-0.3
x=+200
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