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6x-3(x+4)=18
We move all terms to the left:
6x-3(x+4)-(18)=0
We multiply parentheses
6x-3x-12-18=0
We add all the numbers together, and all the variables
3x-30=0
We move all terms containing x to the left, all other terms to the right
3x=30
x=30/3
x=10
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