Question

Aflati x E N stiind ca : a) 15/x+1=3/7 b) x+3/9=2/3 c) 2/x+3= x +3/8

Answer 1

a) 15/(x+1)=3/7
105=3x+3
3x=102
x=34

b) (x+3)/9=2/3
3x+9=18
3x=9
x=3

c) 2/(x+3)= (x +3)/8
(x+3)²=16
x+3=4
x=1