Question 371049
USe a common denominator, {{{28}}}
{{{(-3/4)(7/7)=-21/28}}}
{{{-3/4+9/28=-21/28+9/28}}}
{{{-3/4+9/28=(-21+9)/28}}}
{{{-3/4+9/28=-12/28}}}
{{{-3/4+9/28=highlight(-3/7)}}}