a)x-2/5=2x-1/13
13 (x-2)=5 (2x-1)
13x-26=10x-5
13x-10x=-26+5
3x=-21
x=-21÷3
x=-7
b)2x+3/x+5=7/4
7 (x+5)=4 (2x+3)
7x+35=8x+12
7x+8×=35-12
-x=23
c)4x-5/3=2x+8/2
3(2x+8)=2 (4x-5)
6x+24=8x-10
6x-8x=24+10
-2x=34
x=34÷(-2)
x=17
d)3x+11/9=x+6/4
4 (3x+11)=9 (x+6)
12x+44=9x+54
12x-9x=44-54
3×=-10
x=(-10)÷3
x=-10/3
×=3,(3)
e)4/9=3x+1/2x+12
4 (2x+12)=9 (3x+1)
8x+48=27x+9
8x-27x=48-9
-19×=39
x=39÷(-19)
x=39/-19
×=−2.0526315789
f)3/5x+2=7/2x+15
3 (2x+15)=7 (5x+2)
6x+45=35x+14
6x-35x=45-14
-29×=31
×=-29/31