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170+.40x=80+.70x
We move all terms to the left:
170+.40x-(80+.70x)=0
We add all the numbers together, and all the variables
.40x-(.70x+80)+170=0
We get rid of parentheses
.40x-.70x-80+170=0
We add all the numbers together, and all the variables
-0.3x+90=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-90
x=-90/-0.3
x=+300
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