Answer: 85 m + 20
Step-by-step explanation:
Make fractions have same, common denominator. LCD = 40
7/8 = 35/40
9/10 = 36/40
2/5 = 16/40
3/1 = 120 / 40
[tex]\frac{35}{40}m+\frac{36}{40}-\frac{120}{40}m - \frac{16}{40}[/tex]
35m + 36 - 120m - 16
85 m + 20
