(x+4)(-3x-3)+3x(x+3)=0

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Solution for (x+4)(-3x-3)+3x(x+3)=0 equation: 



(x+4)(-3x-3)+3x(x+3)=0

We multiply parentheses

3x^2+(x+4)(-3x-3)+9x=0

We multiply parentheses ..

3x^2+(-3x^2-3x-12x-12)+9x=0

We get rid of parentheses

3x^2-3x^2-3x-12x+9x-12=0

We add all the numbers together, and all the variables

-6x-12=0

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

-6x=12

x=12/-6

x=-2

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