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n + 1/4 = 9/20 n + 5/20 = 9/20 n = 4/20 = 1/5
n=9. Because n+42=51. Subtract 42 from both sides and n=9
To find the value of n -7n=63 n=63/-7 n-9 Hence,-9 is the required answer.
2n/6 - 9 or n/3 - 9
Let the two numbers be 'm' & 'n' Sum = m + n = -9 Product is mn = -90 Hence m = -90/n Substitute -90/n + n = -9 Multiply through by 'n' -90 + n^2 = - 9n n^2 + 9n - 90 = 0 It is now in quadratic form ; factor (n + 15)(n - 6) = 0 n = -15 & n = 6