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(5x+6)(x+12)-(5x-6)(x+3)=0
We multiply parentheses ..
(+5x^2+60x+6x+72)-(5x-6)(x+3)=0
We get rid of parentheses
5x^2+60x+6x-(5x-6)(x+3)+72=0
We multiply parentheses ..
5x^2-(+5x^2+15x-6x-18)+60x+6x+72=0
We add all the numbers together, and all the variables
5x^2-(+5x^2+15x-6x-18)+66x+72=0
We get rid of parentheses
5x^2-5x^2-15x+6x+66x+18+72=0
We add all the numbers together, and all the variables
57x+90=0
We move all terms containing x to the left, all other terms to the right
57x=-90
x=-90/57
x=-1+11/19
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