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.40x+.60(80-x)=36
We move all terms to the left:
.40x+.60(80-x)-(36)=0
We add all the numbers together, and all the variables
.40x+.60(-1x+80)-36=0
We multiply parentheses
.40x-0.6x+48-36=0
We add all the numbers together, and all the variables
-0.2x+12=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-12
x=-12/-0.2
x=+60
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