решите уравнения

х+3х+5=17

3.5х+2.2х=4.56

3.2y-2.7y=0.6

3.7z-z=0.54

1) x+3x+5=17

    4x=12

      x=3

2)3.5x+2.2x=4.56

   5.7x=4.56

       x=0.8

3)3.2y-2.7y=0.6

   0.5y=0.6

       y=1.2

4)3.7z-z=0.54

   2.7z=0.54

       z=0.2

х + 3х + 5 = 174х + 5 = 17

4х = 17 - 5

4х = 12

х = 3

_____________________3,5х + 2,2х = 4,565,7х = 4,56

х = 0,8

______________________3,2y - 2,7y = 0,60,5у = 0,6

у = 1,2

______________________3,7z - z = 0,54

2,7z = 0,54

z = 0,2