step-by-step explanation:
1.
8m +4n +7m-2n
=8m+7m+4n-2n
=15m+2n
2.
12(5y+4)
=60y+48 [ Using distributive law]
Therefore it is binomial of one variable.
3.
[tex]-2(\frac{1}{3}x -\frac{1}{5} )[/tex]
[tex]=-\frac{2}{3} x +\frac{2}{5}[/tex]
4.
4d+12
=4(d+3)
5.
-4.5n+3
= -4(5n+3)