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7 pangkat dua = 49 3 pangkat 2 =9
49-9 = 40
7-3 = 4
7 +3 = 10
a - b = 4
a= 4+b
a² - b² = 40
(4+b)² - b² = 40
16 +8b+b² - b² = 40
8b = 32
b=4
a = 4+4 = 8
nilai a+b = 8+4 = 12