N107.
5m*20n =5*63*20*4=25200
m=63
n=4
N108.
2(x+7)=2x+14
7(5-a)=35-7a
(c-8)*12=12c-96
14(3a-2)=42a-2
8(4a-3b+11c)=32a-24b+88c
(6x+4y-2z)*15=90x+60y-30z
N111.
7a+8a=15a
16b-5b=11b
27c-c=26c
d+34d=35d
3x+5x+17x=25x
46y-18y+22y=55y
12a+13a+26=25a+26
59z-z+73=58z+73
38x+17x-54x+x=2x