Question 479699
{{{3x(-2y+7)+3x=3x(-2y+7+1)=3x(-2y+8)=3x*(-2)(y-4)=-6x(y-4)}}}
or 
{{{3x(-2y+7)+3x=3x*(-2y)+3x*7+3x=-6xy+21x+3x=-6xy+24x}}}