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Un = a + ( n - 1 ) × b
a = -18
b = -4
U20 = -18 + ( 20 - 1 ) × (-4)
U20 = -18 + (19) × (-4)
U20 = -18 -76
U20 = -94
U20 = -18 + ( 22 - 1 ) × (-4)
U20 = -18 + (21) × (-4)
U20 = -18 -84
U20 = -102
U20 + U22 = -94 + (-102)
U20 + U22 = -196