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U4 = a + 3b = 46
________________-
3b = 15
b = 5
a + 3b = 46
a + 3 x 5 = 46
a + 15 = 46
a = 31
U10 = a + 9b
= 31 + 9 x 5
= 31 + 45
= 76
u4= a+3b=46
____________-
3b=15
b=5
a=?
u4=a+3.5=46
a=46 - 15
a= 31
u10=a+9b
31 + 45 = 76