3x+6(x-7)=21

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Solution for 3x+6(x-7)=21 equation: 



3x+6(x-7)=21

We move all terms to the left:

3x+6(x-7)-(21)=0

We multiply parentheses

3x+6x-42-21=0

We add all the numbers together, and all the variables

9x-63=0

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

9x=63

x=63/9

x=7

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