Решите уравнения |1/y|=2/7 |1/z|=2/5 |2/x|=1/3 |4/x|=8/9

Question

Решите уравнения
|1/y|=2/7
|1/z|=2/5
|2/x|=1/3
|4/x|=8/9

Answer 1

1) |y|=7/2
y1=-7/2 
y2=7/2

2) |z|=5/2
z1=5/2
z2=-5/2

3) |x|=6
x1=6
x2=-6

4) |x|=9/2
x1=9/2
x2=-9/2