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80+0.40x=50+0.50x
We move all terms to the left:
80+0.40x-(50+0.50x)=0
We add all the numbers together, and all the variables
0.40x-(0.50x+50)+80=0
We get rid of parentheses
0.40x-0.50x-50+80=0
We add all the numbers together, and all the variables
-0.1x+30=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-30
x=-30/-0.1
x=+300
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