а) 3*(-3х-1)-2*(7-4х)=3
– 9x – 3 – 14 + 8x = 3
– 9x + 8x = 3 + 14 + 3
-x = 20
x = -20
б) -9*(а-5)+3*(5+2а)=30
– 9a + 45 + 15 + 6a = 30
– 9a + 6a = 30 – 15 – 45
-3a = -30
a = 10
а) 3*(-3х-1)-2*(7-4х)=3
– 9x – 3 – 14 + 8x = 3
– 9x + 8x = 3 + 14 + 3
-x = 20
x = -20
б) -9*(а-5)+3*(5+2а)=30
– 9a + 45 + 15 + 6a = 30
– 9a + 6a = 30 – 15 – 45
-3a = -30
a = 10