Question

2x+5=3
U=N
U=Z
U=Q


3x+4=5
U=N
U=Z
U=Q

9+2x=0
U=N
U=Z
U=Q
ISSOÉ UMA LETRA X

Answer 1

$2x+5=3\to 2x=5-3\to 2x=2\to x= \frac{2}{2} \to x=1$



$3x+4=5\to 3x=5-4\to 3x=1\to x= \frac{1}{3}\to x=0,333...$



$9+2x=0\to 2x=-9\to x= \frac{-9}{2}\to x=-4,5$