Reduza a uma potência​

2/5a+7/3ab+(-ab/6)+3/4a=
2/5a + 7/3ab - ab/6 + 3/4a = ---mmc(5,3,6,4)= 60
24a + 140ab - 10ab + 45a = 
24a + 45a + 140ab - 10ab=
69a + 130ab = a(69 + 130b)   <--- binômio

4/7abc-abc+b+9a+2/3abc+7a = ---mmc (7,3)= 21
12abc - 21abc + 21b + 189a + 14abc + 147a = 
5abc +21b +336a = b(5ac+21) + 336a <--- binômio

3/5x-(7/10y+8/15x)-1/20y =
3/5x- 7/10y + 8/15x - 1/20y = ---> mmc(5,10,15,20)=60
36x - 42y + 32x - 3y =
68x -45y​