(0.7-11/30)x (-1 2/7)+(0.25-11/24):2 11/12=
=(0,7х-11/30х)*(-9/7)+(25/100-11/24):35/12=
=-0,1х*9+11/10*1/7х+(150/1200-245/1200)*12/35=
-0,1х+11/70х-95/1200*12/35=-1/10х+11/70х+19/100*1/7=
=-7/70х+11/70х+19/700=4/70х+19/700=0
4/70х=19/700
х=19/700:4/70
х=19/700*70/4
х=19/10*1/4
х=19/40