-3(10-7x)=390

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Solution for -3(10-7x)=390 equation: 



-3(10-7x)=390

We move all terms to the left:

-3(10-7x)-(390)=0

We add all the numbers together, and all the variables

-3(-7x+10)-390=0

We multiply parentheses

21x-30-390=0

We add all the numbers together, and all the variables

21x-420=0

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

21x=420

x=420/21

x=20

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