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100+.40x=50+.50x
We move all terms to the left:
100+.40x-(50+.50x)=0
We add all the numbers together, and all the variables
.40x-(.50x+50)+100=0
We get rid of parentheses
.40x-.50x-50+100=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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