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160+.4x=80+.9x
We move all terms to the left:
160+.4x-(80+.9x)=0
We add all the numbers together, and all the variables
.4x-(.9x+80)+160=0
We get rid of parentheses
.4x-.9x-80+160=0
We add all the numbers together, and all the variables
-0.5x+80=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-80
x=-80/-0.5
x=+160
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