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2x+30=9x-50
We move all terms to the left:
2x+30-(9x-50)=0
We get rid of parentheses
2x-9x+50+30=0
We add all the numbers together, and all the variables
-7x+80=0
We move all terms containing x to the left, all other terms to the right
-7x=-80
x=-80/-7
x=11+3/7
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