19(2+m) -3(1,5+n) 2,8(3-m) -1,5(2-n) 4(1,2-m) 1,3(n-5) 2 -2,5a+1,8a+1,5a 3,2b--4,3b-3,2b 1/2c+1/3c+1/6c 1,9b-4,2b-3,1b 7,2a-5a-1,3a 1/3b+1/5b+2/15b

9(2+m)=18+9m
-3(1,5+n)=-4,5-3n
2,8(3-m)=8,4-2,8m
-1,5(2-n)=-3+1,5n
4(1,2-m)=4,8-4m
1,3(n-5)=1,3n-6,5
#2
-2,5a+1,8a+1,5a=0,8a
3,2b-(-4,3b)-3,2b=3,2b+4,3b-3,2b=4,3b
1/2c+1/3c+1/6c=3/6c+2/6c+1/6c=c
1,9b-4,2b-3,1b=-5,4b
7,2a-5a-1,3a=0,9a
1/3b+1/5b+2/15b=5/15b+3/15b+2/15b=10/15b=2/3b