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U₂ = a + b
----------------- -
30 = 5b
b = 6
U₂ = 6 x U₇
a + b = 6 x (a + 6b)
a + 6 = 6 x (a + 6 x 6)
a + 6 = 6 x (a + 36)
a + 6 = 6a + 216
-5a = 210
a = -42
U₁₂ = a + 11b
= -42 + 11 x 6
= -42 + 66
= 24
semoga jelas dan membantu ya