Question

the sum of two rational number is -7. if one of the number is 15/7 ,then the other is

Answer 1

let the number is x
x+ 15/7 = -7
$x = - 7 - \frac{15}{7} \\ \\ x = \frac{ (- 49 - 15)}{7} \\ \\ x = \frac{ - 64}{7}$
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Answer 2

the other number is :-64/7
let the unknown number be x 
x+15/7=-7
x=-7-15/7
x=-49/7-15/7
x=-64/7