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U7=a+6b=37
U7-u3=a+6b-a-2b
37-9= 4b
b= 28/4=7
a+2b=9
a+14=9
a= -5
U20= a+(n-1)b= -5+(19)7= -5+ 133= 128
b=(37-9):4 =28:4 = 7
Un = a + (n-1)b
U3 = a + (3-1)4
9 = a + (2)4
9 = a + 8
a = 8 - 9
a = -1
Un = a + (n-1)b
U20= -1 +(20-1)4
U20 = -1 + (19)4
U20 = -1 + 76
U20= 75
Jadi U20 = 75