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suku empat dan enam = (a+3b) + (a+5b) = 28
maka
a + b = 5
2a+ 8b= 28
2a+2b = 10 [x2]
2a + 8b = 28 -
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eliminasi= -6b = -18
b = 3
substitusikan b
a+b = 5
a+3 = 5
a = 5-3 = 2
U9 = 2 + (9-1)3
U9 = 2 + 8 . 3
U9 = 2 +24
U9 = 26
u4 + u6... (a + 3b) + ( a + 5b) = 2a + 8b =28
2a + 2b = 10
2a + 8b = 28 -
-6b = - 18
b = 3
a + b = 5
a = 2
u9... a + 8b = 2 + 3*8
= 2 + 24 = 26