1) (с-120)*70=280
70с - 8400 = 280
70с = 280+8400
70с = 8680
c = 8680 : 70
c = 124
2) x÷(160÷8)=105
x÷20=105
x = 20*105
x = 2100
3) y+127=72782÷241
y+127=302
y=302-127
y=175
4) c+12*7=12*7
c+84=84
c=84-84
c=0
5) x÷(160÷8)=0
x÷20=0
x=0
6) y+(127-127)=72782÷241
у+(0)=302
y = 302