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30+.2x=20+.3x
We move all terms to the left:
30+.2x-(20+.3x)=0
We add all the numbers together, and all the variables
.2x-(.3x+20)+30=0
We get rid of parentheses
.2x-.3x-20+30=0
We add all the numbers together, and all the variables
-0.1x+10=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-10
x=-10/-0.1
x=+100
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