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bilangan 2 = b
a - b = 4
b = 4 - a
b^2 = a + 16
(4 - a)^2 = a + 16
16 - 8a + a^2= a + 16
a^2 - 8a = a
a^2 = 9a
a × a = 9a
a = 9a /a
a = 9
a - b = 4
9 - b = 4
-b = -5
b = 5
jumlah = a + b
= 9 + 5
= 14