a)5/9*x=125/18
x=125/18 / 5/9
x=125/18 * 9/5
x=125*9/18*5
x=25/2
x=12,5
b)2x/3+5/6=7/2
2x/3=7/2-5/6
4x/6=21/6-5/6
4x=21-5
4x=16
x=16/4
x=4
c)15x -6/4-3x/2=1
15x- 6/4- 6x/4=4/4
15x-6-6x=4
9x=10
x=10/9
d)2,(3)x +7/6 =0,(6)x +7/3
21x/9 +7/6=6x/9+7/3
21x/9-6x/9=7/3-7/6
15x/9 =14-7/6
5x/3=7/6
10 x=7
x=7/10