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9x+3(2x-4)=18
We move all terms to the left:
9x+3(2x-4)-(18)=0
We multiply parentheses
9x+6x-12-18=0
We add all the numbers together, and all the variables
15x-30=0
We move all terms containing x to the left, all other terms to the right
15x=30
x=30/15
x=2
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