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130+.20x=80+.40x
We move all terms to the left:
130+.20x-(80+.40x)=0
We add all the numbers together, and all the variables
.20x-(.40x+80)+130=0
We get rid of parentheses
.20x-.40x-80+130=0
We add all the numbers together, and all the variables
-0.2x+50=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-50
x=-50/-0.2
x=+250
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