20x + 4 = 4(5x + 1)
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x2-20x+100 = (x-10)(x-10) when factored
If x is used to represent the unknown number, then the expression for 20 times a number would be 20x.
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50x squared equals 20x-2 equals zero is not possible, for 20x-2 = 0 --> x = 1/10 While 50x2 = 0 means that x should be zero. So either 50x2 =/ 20x-2 or 20x-2 =/ 0
x2 + 20x - 39 = 0: Add 61 giving: x2 + 20x + 100 = (x + 10)2