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U15 = U10 + 5b
= 15 + 5.2
= 15 + 10
= 25
U10 = a + 9b = 15 -
- 4b = -8
b = 2
a + 5b = 7
a + 5.2 = 7
a = 7 - 10
a = -3
U15 = a + 14 b
U15 = -3 + 14.2
U 15 = 25
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