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3x-9+5x=11x-30
We move all terms to the left:
3x-9+5x-(11x-30)=0
We add all the numbers together, and all the variables
8x-(11x-30)-9=0
We get rid of parentheses
8x-11x+30-9=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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