Resolva as equações:

a) 4x + 8 = 3x - 5

4x-3x=-5-8

x= -13

b) 3a - 4 = a + 1

3a-a=1+4

2a=5

a=5/2

c) 9y - 11 = -2

9y=-2+11

9y=9

y=9/9

y=1

d) 5x - 1 = 8x + 5

5x-8x=5+1

-3x=6

x=6/-3

x=-2