Question

what should be added to12/7 to get 1

Answer 1

Let, that no. be x.

12/7+x=1

x=1-12/7

x=7-12/7

x=-5/7

So,the answer is -5/7

Answer 2

let the number be x

so

$\frac{12}{7 \: } \: + x \: = 1 \\ x \: = 1 - \: \frac{12}{7} \\ x \: = \frac{7 - 12}{7} \\ x \: = \frac{ - 5}{7} \\ \frac{ - 5}{7} \: \: \: should \: be \: added$