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