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60+.80x=100+.30x
We move all terms to the left:
60+.80x-(100+.30x)=0
We add all the numbers together, and all the variables
.80x-(.30x+100)+60=0
We get rid of parentheses
.80x-.30x-100+60=0
We add all the numbers together, and all the variables
0.5x-40=0
We move all terms containing x to the left, all other terms to the right
0.5x=40
x=40/0.5
x=80
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