Question

Cat da 3x+2pe7x+9=2pe5

Answer 1

3x+2 / 7x+9 = 2/5 ( 0,4) 
3x+ 2 = 0,4 ( 7x + 9)
3x+2 = 2,8x + 3,6 
3x - 2,8 x = 3,6 -2 
0,2x = 1,6 
x = 1,6 : 0,2 
x = 8

Answer 2

$\dfrac{3x+2}{7x+9}=\dfrac{2}{5}$
$5(3x+2)=2(7x+9)$
$15x+10=14x+18$
$15x-14x=18-10$
$x=8$