1)
7x*14=6*49
98x=2294
x=294:98
x=3
=========
2)
5x*2=15*3
10x=45
x=45:10
x=4,5
=========
3)
2x*13=8*39
26x=312
x=312:26
x=12
=========
4)
7x*2=3*28
14x=84
x=84:14
x=6
=========
5)
3/14=21/2x+62
3*(2x+62)=14*21
6x+186=294
6x=294-186
6x=108
x=108:6
x=18
=========
6)
9/10=63/5x+40
9*(5x+40)=63*10
45x+360=630
45x=630-360
45x=270
x=270:45
x=6