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90+.2x=40+.3x
We move all terms to the left:
90+.2x-(40+.3x)=0
We add all the numbers together, and all the variables
.2x-(.3x+40)+90=0
We get rid of parentheses
.2x-.3x-40+90=0
We add all the numbers together, and all the variables
-0.1x+50=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-50
x=-50/-0.1
x=+500
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