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3(2x-0.4x)=18

We move all terms to the left:

3(2x-0.4x)-(18)=0

We add all the numbers together, and all the variables

3(+1.6x)-18=0

We multiply parentheses

3x-18=0

We move all terms containing x to the left, all other terms to the right

3x=18

x=18/3

x=6

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