3 (*+5) - (4-*) - (1+3) * - 3

1) 3/5-1/4+1/3=41/60

3/5-1/4=12/20-5/20=7/20

7/20+1/3=21/60+20/60=41/60

2) (2/3+1/9) - 13/18=1/18

2/3+1/9=6/9+1/9=7/9

7/9-13/18=14/18-13/18=1/18

3) 3/4-1/2+7/8=1. 1/8

3/4-1/2=3/4-2/4=1/4

1/4+7/8=2/8+7/8=9/8=1 1/8

4) 5/6-2/3+1/4=5/12

5/6-2/3=5/6-4/6=1/6

1/6+1/4=2/12+3/12=5/12

5) 1/3 - (1/9+1/6) = 1/18

1/9+1/6=2/18+3/18=5/18

1/3-5/18=6/18-5/18=1/18

3x+15-4+x-x-3x-3

3x+x-x-3x=-15-4+3

0=-16

x = - 16:0

x=0