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a . b = 4b²
a - b = 51
a = 51 + b
a . b = 4b²
(51 + b)b = 4b²
51 + b = 4b
51 = 3b
17 = b
a - b = 51
a = 51 + b
a = 51 + 17
a = 68
∴ a + b = 68 + 17 = 85