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a) 6x + 8 = 23

6x + 8 - 8 = 23 - 8

6x = 15

x = 15/6 = 5/2

b) 7x - 13 = 4x + 23

7x - 4x = 23 + 13

3x = 39

x = 39/3 = 13

c) 3(2x - 7) = 4(8 + 4)

6x - 21 = 32 + 16

6x - 21 = 48

6x = 48 + 21 = 69

x = 69/6 = 23/2

d) x² = 24,61

x = √24,61 = 4,9604846

e) (8x - 4)(3x + 7) = 0

⇒ 8x - 4 = 0

8x = 0 + 4 = 4

x = 4/8 = 1/2

⇒ 3x + 7 = 0

3x = 0 - 7 = -7

x = -7/3

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