14*(1/2m+3/7n)=14*1/2m+14*3/7n=7m+2*3n=7m+6n
1/6*(12/17b-18/23c)=1/6*12/17b-1/6*18/23c=2/17b-3/23c
8*(1/4p-5/24q+7/12t)=8*1/4p-8*5/25q+8*7/12t)= 2p-5/3q+2*7/3t=2p-1 2/3q+14/3p=2p-1 2/3q+4 2/3p
1 3/4*(4a+16/21b-2 2/3)=7/4*4a+7/4*16/21b-7/4*8/3)= 7a+4/3b-14/3=7a+1 1/3b-4 2/3