(x+9)(2x-7)-(x+9)^2=x^2-7x-144

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Solution for (x+9)(2x-7)-(x+9)^2=x^2-7x-144 equation: 



(x+9)(2x-7)-(x+9)^2=x^2-7x-144

We move all terms to the left:

(x+9)(2x-7)-(x+9)^2-(x^2-7x-144)=0

We get rid of parentheses

-x^2+(x+9)(2x-7)-(x+9)^2+7x+144=0

We multiply parentheses ..

-x^2+(+2x^2-7x+18x-63)-(x+9)^2+7x+144=0

We add all the numbers together, and all the variables

-1x^2+(+2x^2-7x+18x-63)+7x-(x+9)^2+144=0

We get rid of parentheses

-1x^2+2x^2-7x+18x+7x-(x+9)^2-63+144=0

We add all the numbers together, and all the variables

x^2+18x-(x+9)^2+81=0

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

x^2+18x-(x+9)^2=-81

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