1)108:90=42:5х
2)(7х-3)/4 = (5-2х)/6
3)5/2х = 3/(4-х)
5)2/(6-х)= 4/(5х+3)

1. 108:90=42:5х

1.2=x

*1.2=x

*=x

=x

x=

2.(7х-3)/4 = (5-2х)/6

6(7x-3)=4(5-2x)

42x-18=20-8x

42x+8x=20+18

50x=38

x=

3. 5/2х = 3/(4-х)

x=, x4

5x=

5x*(4-x)=6

5x*(4-x)-6=0

20x--6=0

-+20x-6=0

5x2-20x+6=0

x=

x=

x=

x=

x=  x=

x=  x=, x4

x_{1} = x_{2} =

5. 2/(6-х)= 4/(5х+3)

, x