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50+.40x=30+.50x
We move all terms to the left:
50+.40x-(30+.50x)=0
We add all the numbers together, and all the variables
.40x-(.50x+30)+50=0
We get rid of parentheses
.40x-.50x-30+50=0
We add all the numbers together, and all the variables
-0.1x+20=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-20
x=-20/-0.1
x=+200
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