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6x+30=3x+99
We move all terms to the left:
6x+30-(3x+99)=0
We get rid of parentheses
6x-3x-99+30=0
We add all the numbers together, and all the variables
3x-69=0
We move all terms containing x to the left, all other terms to the right
3x=69
x=69/3
x=23
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