You can't prove it, because it's usually not true.
The only time it's true is when x=0 .
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x2 23x equals 0
If: x2-4 = 0 Then: x = 2
x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i
x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
144X = X2 144X - X2 = 0 (144 - X)X = 0 X = 0 or X = 144