(x+12)(x+3)-x(x+9)=84

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Solution for (x+12)(x+3)-x(x+9)=84 equation: 



(x+12)(x+3)-x(x+9)=84

We move all terms to the left:

(x+12)(x+3)-x(x+9)-(84)=0

We multiply parentheses

-x^2+(x+12)(x+3)-9x-84=0

We multiply parentheses ..

-x^2+(+x^2+3x+12x+36)-9x-84=0

We add all the numbers together, and all the variables

-1x^2+(+x^2+3x+12x+36)-9x-84=0

We get rid of parentheses

-1x^2+x^2+3x+12x-9x+36-84=0

We add all the numbers together, and all the variables

6x-48=0

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

6x=48

x=48/6

x=8

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