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100+.20x=40+30x
We move all terms to the left:
100+.20x-(40+30x)=0
We add all the numbers together, and all the variables
.20x-(30x+40)+100=0
We get rid of parentheses
.20x-30x-40+100=0
We add all the numbers together, and all the variables
-29.8x+60=0
We move all terms containing x to the left, all other terms to the right
-29.8x=-60
x=-60/-29.8
x=2+0.4/29.8
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