9*4 + 9*15 = 9*19 = 171.
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5y - 4 + 9y - 1y + 15= 5y + 9y - 1y + 15 - 4= (5 + 9 - 1)y + (15 - 4)= 13y + 9
That will depend on the plus or minus vallues of 15, 4, x and 9 which have not been given
-9 4/5 +9 15/16= -4/5+15/16= -64/80+75/80= 11/80
6 - (-9) = 15 15 + 2 = 17 17 - 4 = 13 is the answer.
13 - 4 + 15 ÷ 3 =13 - 4 + 5 = 9 + 5 = 14