3x(x-1)=3x2+21

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Solution for 3x(x-1)=3x2+21 equation: 



3x(x-1)=3x^2+21

We move all terms to the left:

3x(x-1)-(3x^2+21)=0

We multiply parentheses

3x^2-3x-(3x^2+21)=0

We get rid of parentheses

3x^2-3x^2-3x-21=0

We add all the numbers together, and all the variables

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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