1)5.4/15-x=4.13/15
x=5.4/15-4.13/15
x=6/15
5.4/15-6/15=4.13/15
4.13/15=4./13/15
2)(5/18+x)-3.11/18=2.13/18
5/18+x=3.11/18+2.13/18
5/18+x=6.6/18
x=6.6/18-5/18
x=6.1/18
(5/18+6.1/18)-3.1/18=2.13/18
2.13/18=2.13/18
1)5.4/15-x=4.13/15
x=5.4/15-4.13/15
x=6/15
5.4/15-6/15=4.13/15
4.13/15=4./13/15
2)(5/18+x)-3.11/18=2.13/18
5/18+x=3.11/18+2.13/18
5/18+x=6.6/18
x=6.6/18-5/18
x=6.1/18
(5/18+6.1/18)-3.1/18=2.13/18
2.13/18=2.13/18