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30x/3-9=3x+123
We move all terms to the left:
30x/3-9-(3x+123)=0
We get rid of parentheses
30x/3-3x-123-9=0
We multiply all the terms by the denominator
30x-3x*3-123*3-9*3=0
We add all the numbers together, and all the variables
30x-3x*3-396=0
Wy multiply elements
30x-9x-396=0
We add all the numbers together, and all the variables
21x-396=0
We move all terms containing x to the left, all other terms to the right
21x=396
x=396/21
x=18+6/7
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