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3x+3(4x+18)=159
We move all terms to the left:
3x+3(4x+18)-(159)=0
We multiply parentheses
3x+12x+54-159=0
We add all the numbers together, and all the variables
15x-105=0
We move all terms containing x to the left, all other terms to the right
15x=105
x=105/15
x=7
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