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(a + b) + (a + 2b) = 65
2a + 3b = 65
U5 = a + 4b = 22
2a + 3b = 65
a + 4b = 22
2a + 3b = 65
2a + 8b = 44
-5b = 21
b = -4,2, a = 36,8
U25 = a + 24b = 36,8 + 24(-4,2) = -64