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2(x+2x-3)=18
We move all terms to the left:
2(x+2x-3)-(18)=0
We add all the numbers together, and all the variables
2(3x-3)-18=0
We multiply parentheses
6x-6-18=0
We add all the numbers together, and all the variables
6x-24=0
We move all terms containing x to the left, all other terms to the right
6x=24
x=24/6
x=4
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