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Ответ:

а)9x - (3x + 5 )= 0

9x-3x-5=0

6x-5=0

6x=5

х=0,83

б)4(5x-2) = 2x + 10

20х-8=2x +10

20х-2х = 10 + 8

18x=18

x = 1

в)х/3+х/2=15

2x + 3x = 90

5x = 90

x = 18