21a^2b^2 - 28ab = (7ab + 0) (3ab - 4)
=> ab1 = 0/7 = 0
=> ab2 = 4/3
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21a^2b^2 - 28ab = (7ab + 0) (3ab - 4)
=> ab1 = 0/7 = 0
=> ab2 = 4/3