Question 1010821
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Find the value of 8u-7 given that -7u-9=5 
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-7u - 9 = 5 implies that -7u = 5 + 9 = 14. Hence, u = {{{14/(-7)}}} = -2.


Now you can easily calculate 8u -7.


It is 8*(-2) - 7 = -23.