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144 9+7 = 16 and 9*16 = 144
6+4=10
Since 2 plus 4 is not 10, the "if" statement is false. Given a false "if", logically, 9 + 2 can equal anything you like.
solution with [OH-] = 2.5 x 10-9 , A solution with [H+] = 1.2 x 10-4, A solution with pH = 4.5
144 9+7 = 16 and 9*16 = 144