Question

what number should be added to -1 so as to get 5/7

Answer 1

-1+x=5/7

we take the number to be found as x

so therefore

x=5/7+1

x=12/7

Answer 2

equation is -1+x=5/7
x=5/7+1
x=(5+7)/7
x=12/7

(-1)+12/7=5/7
-1/1+12/7 =5/7

(-7+12)/7=5/7
5/7=5/7