x = 0
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If: x2+x = 12 Then: x2+x-12 = 0 And using the quadratic formula: x = -4 or x = 3
(x + 12)(x - 6) = 0 x = 6 or -12
x2-7x+12 = 0 (x-3)(x-4) = 0x=3,4
(x-2)(x+12) = 0 x = 2 or x -12
144X = X2 144X - X2 = 0 (144 - X)X = 0 X = 0 or X = 144