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u6 = a+5b =23
(eliminasi/dikurang)
-3b = -12
b = -12/-3
b= 4
a + 2b = 11
a + 2.4 = 11
a + 8 = 11
a = 11-8
a = 3
S7 = n/2 (2a+(n-1)b)
= 7/2 (2.3 + 6.4)
= 7/2 (6+24)
= 7/2 (30)
= 105 (c)
U7 = a+5b=23
U7-U3 dikurangin
jadi : 3b=12
b=4
a=3
S7=7/2 * (a+u7)
=7/2 *(3+23)
=7/2*26
=91
eh salah