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50=0.9x+20
We move all terms to the left:
50-(0.9x+20)=0
We get rid of parentheses
-0.9x-20+50=0
We add all the numbers together, and all the variables
-0.9x+30=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-30
x=-30/-0.9
x=33+0.3/0.9
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