[tex]a] \ 7x+8=7\cdot4+8=28+8=36\\\\b] \ 8y+20=8\cdot(-3)+20=-24+20=-4\\\\c] \ 8(5-n)=8\cdot(5-0)=8\cdot5=40\\\\d] \ 7-6p=7-6\cdot\frac{1}{2}=7-3=4[/tex]
