3.Реши уравнения?
25 - (х + 9) : 5 = 19
540/(4*x-2)=30​

25 - ( х - 9 ) : 5 = 19

- ( х + 9 ) : 5 = 19 - 25

- ( х + 9 ) : 5 = - 6

( х + 9 ) : 5 = 6

( х + 9 ) = 30

х + 9 = 30

х = 21

540 : (4x-2)=30​

540/( 4х - 2 ) = 30/1

30(4х - 2 )= 540

4х - 2 = 540 : 30

4х - 2 = 18

4х = 20

х = 5