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u11= a + 10b = p+q -
2b = q
b= q/2
a + 10b = p+q
a + 5q = P + q
a= p - 4q
u5 = a + 4b = (p -4q) + 4(q/2)
= p - 4q + 2q
u5 = p - 2q