Решите уравнение: a) 5x – 4 = 2; б) -12x + 31 = 3 – 4x.

a) 5x – 4 = 2

5x = 2 + 4

5x = 6

x = 6/5

x = 1,2

б) -12x + 31 = 3 – 4x

-12x + 4x = 3 – 31

-8x = -28

x = -28 / -8

x = 28 / 8

x = 7/2

x = 3,5