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U82?
U15=12
U15=a+14b
U20=44
U20=a+19b
U20-U15=44-12
(a+19b)- (a+14b) =32
4b=32
b=32/4
b=8
U15=12
a+14b=12
a+14 (8) =12
a+112=12
a=12-112
a=-100
U60=a+59b
=-100+59 (8)
=-100+472
=372
U82=a+81b
=-100+81 (8)
=-100+648
=548
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