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50-4x=5x+20
We move all terms to the left:
50-4x-(5x+20)=0
We get rid of parentheses
-4x-5x-20+50=0
We add all the numbers together, and all the variables
-9x+30=0
We move all terms containing x to the left, all other terms to the right
-9x=-30
x=-30/-9
x=3+1/3
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