3(2x-9=21)

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Solution for 3(2x-9=21) equation: 



3(2x-9=21)

We move all terms to the left:

3(2x-9-(21))=0

We add all the numbers together, and all the variables

3(2x-30)=0

We multiply parentheses

6x-90=0

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

6x=90

x=90/6

x=15

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