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b= (46-18)/(7-3) = 28/4 =7
a=U3-2b= 18 -14=4
U40= 4+39(7)=4+273=277
2
b=(37-17)/(9-4)=20/5=4
a=17-3b=17-12=5
U41=5+40(4)=5+160=165