-3(2x+8)=18

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Solution for -3(2x+8)=18 equation: 



-3(2x+8)=18

We move all terms to the left:

-3(2x+8)-(18)=0

We multiply parentheses

-6x-24-18=0

We add all the numbers together, and all the variables

-6x-42=0

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

-6x=42

x=42/-6

x=-7

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