Question 1024227
{{{M/N=6/7}}}
{{{7M=6N}}}
{{{35M=30N}}}
.
.

{{{(M+2)/(N+1)=4/5}}}
{{{5(M+2)=4(N+1)}}}
{{{5M+10=4N+4}}}
{{{5M=4N-6}}}
{{{35M=28N-42}}}
Substituting from above,
{{{30N=28N-42}}}
{{{2N=-42}}}
{{{N=-21}}}
So then,
{{{7M=6(-21)}}}
{{{M=-18}}}