it depends on what x is if it was 7 then yes it would equal 140
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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
... You have to know what x and y are first.
2x + 5 = 25 2x = 20x = 10
180=11x+9x. 180 = 20x. 18=2x. 9=x.