21=-3(x-4)30

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Solution for 21=-3(x-4)30 equation: 



21=-3(x-4)30

We move all terms to the left:

21-(-3(x-4)30)=0



We calculate terms in parentheses: -(-3(x-4)30), so:

-3(x-4)30

We multiply parentheses

-90x+360

Back to the equation:

-(-90x+360)



We get rid of parentheses

90x-360+21=0

We add all the numbers together, and all the variables

90x-339=0

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

90x=339

x=339/90

x=3+23/30

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