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(3x)²-(4x)²-x²-60=0
9x-16x-2x-60=0
-7x-2x-60=0
-5x-60=65x
25x^2-20x-4-9x^2+6x+1-x^2-60=0
25x^2-9x^2-x^2-20x+6x-4+1-60=0
15x^2-26x-57 = 0
(15x-19)(x+3) = 0
x=-19/15
x=3