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
SÃO LETRAS ESSES X

Answer 1

2x + 5 = 3
2x + 5 - 3 = 0
2x + 2 = 0
2x = -2
x = -2 / 2
x = -1

3x + 4 = 5
3x + 4 - 5 = 0
3x - 1 = 0
3x = 1
x = 1 / 3
x = 0,3333...

9 + 2x = 0
2x = -9
x = -9 / 2
x = -4,5

Espero ter ajudado. Valeu!

Answer 2

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



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



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