a)
[tex]\bf 36:9\cdot y = 28[/tex]
[tex]\bf 4\cdot y = 28[/tex]
[tex]\bf y = 28:4[/tex]
[tex]\boxed{\bf y=7}[/tex]
==================
b)
[tex]\bf (z:8) + 18 = 7\cdot 3[/tex]
[tex]\bf (z:8) + 18 = 21[/tex]
[tex]\bf (z:8)=21-18[/tex]
[tex]\bf z:8=3[/tex]
[tex]\bf z=3\cdot8[/tex]
[tex]\boxed{\bf z = 24}[/tex]
===================
c)
[tex]\bf (32:w)-6 = 12:6[/tex]
[tex]\bf (32:w)-6 = 2[/tex]
[tex]\bf (32:w) = 2+6[/tex]
[tex]\bf (32:w)=8[/tex] |·w (inmultim relatia cu w)
[tex]\bf 32 = 8w[/tex]
[tex]\bf w=32:8[/tex]
[tex]\boxed{\bf w = 4}[/tex]
