It means 3 multiplied by 0, the answer to this is 0 because anything multiplied by 0 equals 0.
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If you mean: x-3-4 = 0 then x = 7 I mean x + ln (x-3) - 4 =0
If you mean: (3x-1)(x+1) = 0, then it is 3x squared+2x-1 = 0. Its solutions are: x = 1/3 or x = -1.
If you mean: 8x2-64x+120 = 0 then x = 3 or x = 5
x2 + x - 6 = 0 x2 + 3x - 2x - 6 = 0 x(x+3) -2(x+3) = 0 so (x+3)(x-2) = 0 so x+3 = 0 or x-2 = 0 so that x = -3 or x = 2
5x2 + 15x = 0 5x(x + 3) = 0 therefore, x = 0 or x + 3 = 0 that is, x = 0 or x = -3