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U6= a+5b = 86
-------------------- (-)
3b= 602 ...... b=602/3
a+ 5 b = 86
a+5(602/3)=86 ...... a= 86 - 3010/3
U4=a+3b = 86 - 3010/3 + 3 . 602/3 = 688 - 3010/3 = -315 1/3