а) 6-10с=-7с-21
– 10c + 7c = – 21 – 6
-3c = -27
c = 9
в) 0.4х+(-х-1.8)=-2(0.5х-0.3)
0.4x – x – 1.8 = – x + 0.6
0,4x – x + x = 0,6 + 1,8
0.4x = 2.4
x = 6
а) 6-10с=-7с-21
– 10c + 7c = – 21 – 6
-3c = -27
c = 9
в) 0.4х+(-х-1.8)=-2(0.5х-0.3)
0.4x – x – 1.8 = – x + 0.6
0,4x – x + x = 0,6 + 1,8
0.4x = 2.4
x = 6