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140+.3x=70+.8x
We move all terms to the left:
140+.3x-(70+.8x)=0
We add all the numbers together, and all the variables
.3x-(.8x+70)+140=0
We get rid of parentheses
.3x-.8x-70+140=0
We add all the numbers together, and all the variables
-0.5x+70=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-70
x=-70/-0.5
x=+140
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