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3x+3(2x+8)=123
We move all terms to the left:
3x+3(2x+8)-(123)=0
We multiply parentheses
3x+6x+24-123=0
We add all the numbers together, and all the variables
9x-99=0
We move all terms containing x to the left, all other terms to the right
9x=99
x=99/9
x=11
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