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=a+4b=13 (persamaan 1)
u8=a+(n-1)b=22
=a+7b=22(persamaan2)
a+4b=13
a+7b=22
-3b=-9
b=-9/-3
b=3
a+4b=13
a+4.3=13
a=13-12
a=1
u20= a+19b
=1+19.3
=58
= a + 4b = 13
u8 = a + (8-1)b
= a + 7b = 22
eliminasi
a + 4b = 13
a + 7b = 22 _
-3b = -9
b = 3
a + 4b = 13
a = 13 - 4b
a = 13 - 4(3)
a = 13 - 12
a = 1
u20 = a + 19b = 1 + 19(3)
= 58 = C