x/2=8/x
x la puterea a 2-a=8×2=16
x=4
6/x=x/4
x la puterea a 2-a=24
x=2 radical din 6
2x/7=8/7x
2x×7x=7×8
14x la puterea a doua=56
x la puterea a doua =4
x=2
3/4x=3x/4
3×4=4x×3x
12=12x la puterea a doua
x la puterea a doua=1
x=1
9x/5=5/x
9x×x=5×5
9x la a doua=25
3x=5
x=5/3
7x/6=4/3x
7x×3x=4×6
21 x la a doua=24
x la a doua=24/21
x la a doua=8/7
x=2 radical din 2 supra radical din 7