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U8 - U5 = 9 ---> a+7b - (a+4b) = 3b = 9, artinya b = 3
substitusi b = 3 ke persamaan :
2a + 4b = 26
2a + 4(3) = 26
2a = 14
a = 7
dengan demikian nilai U10 = a + 9b = 7 + 9(3) = 7 + 27 = 34