1) x/4+x/3=7
3x/12 + 4x/12 = 7
7x/12 = 7
x = 12
2)2x/5+x/2=9
4x/10 + 5x/10 = 9
9x/10 = 9
x = 10
3)5x/4-x/2=3
5x/4 - 2x/4 = 3
3x/4 = 3
x = 4
4)4x/5-x/10=7
8x/10 - x/10 = 7
7x/10 = 7
x = 10
5)3x/4+5x/6=38
9x/12 + 10x/12 = 38
19x/12 = 38
x = 24
6)2x/3+5x/2=19
4x/6 + 15x/6 = 19
19x/6 = 19
x = 6