6x+3(x-8)=21

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Solution for 6x+3(x-8)=21 equation: 



6x+3(x-8)=21

We move all terms to the left:

6x+3(x-8)-(21)=0

We multiply parentheses

6x+3x-24-21=0

We add all the numbers together, and all the variables

9x-45=0

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

9x=45

x=45/9

x=5

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