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a + 11b = 15
___________ _
- 7b = 21
b = - 3
a = 48
U25 = a + 24b = 48 + 24(-3) = -24
U12 = a+11b=15
-7b=21
b= 21/-7=-3
a+4b= 36
a+4(-3)=36
a=36+12 =48
U25 = a+24b = 48+24(-3)=48-72=-24