-3(3x-7)=9x+21

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Solution for -3(3x-7)=9x+21 equation: 



-3(3x-7)=9x+21

We move all terms to the left:

-3(3x-7)-(9x+21)=0

We multiply parentheses

-9x-(9x+21)+21=0

We get rid of parentheses

-9x-9x-21+21=0

We add all the numbers together, and all the variables

-18x=0

x=0/-18

x=0

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