6а-4а= 10p-8p= 17x-10x=
11а-8а= 12b-6b= 21e-10e=

a=900 b=400 x=800 e=60

b+5b+6b= b+b+b+b= c+c+2c= 4s+3s+7s= t+2t+t+5t
d+d+d+d= 14p+20p+p=
9p+20p+6b= 10a+3a+2a=

b=30 d=800 c=50 p=80 s=20 t=90 a=30