-3(5x+3)=21

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Solution for -3(5x+3)=21 equation: 



-3(5x+3)=21

We move all terms to the left:

-3(5x+3)-(21)=0

We multiply parentheses

-15x-9-21=0

We add all the numbers together, and all the variables

-15x-30=0

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

-15x=30

x=30/-15

x=-2

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