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130+.5x=70+.8x
We move all terms to the left:
130+.5x-(70+.8x)=0
We add all the numbers together, and all the variables
.5x-(.8x+70)+130=0
We get rid of parentheses
.5x-.8x-70+130=0
We add all the numbers together, and all the variables
-0.3x+60=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-60
x=-60/-0.3
x=+200
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