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50+.3x=20+.5x

We move all terms to the left:

50+.3x-(20+.5x)=0

We add all the numbers together, and all the variables

.3x-(.5x+20)+50=0

We get rid of parentheses

.3x-.5x-20+50=0

We add all the numbers together, and all the variables

-0.2x+30=0

We move all terms containing x to the left, all other terms to the right

-0.2x=-30

x=-30/-0.2

x=+150

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