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70+.2x=40+.3x
We move all terms to the left:
70+.2x-(40+.3x)=0
We add all the numbers together, and all the variables
.2x-(.3x+40)+70=0
We get rid of parentheses
.2x-.3x-40+70=0
We add all the numbers together, and all the variables
-0.1x+30=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-30
x=-30/-0.1
x=+300
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