a - 4 - a = 4 - 4 - a mmc = 20
5 4
20a - 4(4-a) = 80 - 5(4 - a)
20a - 16 + 4a = 80 - 20 + 5a
24a +20a = 60 +16
44a = 76
a = 66
76
b) 2x - 5 + x - 1 = 13x + 3 mmc = 8
8 2 4
2x + 5 + 4(x - 1) = 5(13x + 3)
2x + 5 + 4x - 4 = 65x + 15
5 - 4 - 15 = 65x - 6x
- 14 = 59x
x = - 14
59
