4/5=x+5/10
8=x+5
x=3
11*11*11-11*11-10
=11*11(11-1)-10
=11*11*10-10
=(11*11-1)*10
=120*10
=1200
36*1111+8888*8
=36*1111+1111*8*8
=(36+64)*1111
=111100