0 times x is written as 0x. This is always equal to zero because anything times zero is always zero.
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"< 0" For example x < 0 means "x less than zero".
3Y*12X = 0 is equivalent to YX = 0 In functional form, it is Y = z*(X = 0) where z can have any value. Here (X = 0) is 1 if X = 0 and the statement is TRUE 0 if X ≠ 0 and the statement is FALSE.
400,000 = (4 x 105) + (0 x 104) + (0 x 103) + (0 x 102) + (0 x 101) + (0 x 100)
90,000 = (9 x 104) + (0 x 103) + (0 x 102) + (0 x 101) + (0 x 100)
3,000 = (3 x 10000) + (0 x 1000) + (0 x 100) + (0 x 10) + (0 x 1)