Question 164661
{{{(-6s^2 +5s+4)-(7s^2+4)=(-6s^2-7s^2)+(5s)+(4-4)}}}
{{{(-6s^2 +5s+4)-(7s^2+4)=(-13s^2)+(5s)+(0)}}}
{{{(-6s^2 +5s+4)-(7s^2+4)=-13s^2+5s}}}