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Răspuns:

a)

2X - 8=0

2X=8

X/8/2=4

b)

5X -10=0

5X=10

X=10/5=2

c) 4X +8=0

4X=-8

X=-2

d) 7X +21=0

7X =-21

X=-3

Explicație pas cu pas:

a)

[tex]2x - 8 = 0 \iff 2x = 8 \\ x = \frac{8}{2} \implies x = 4[/tex]

b)

[tex]5x - 10 = 0 \iff 5x = 10 \\ x = \frac{10}{5} \implies x = 2[/tex]

c)

[tex]4x + 8 = 0 \iff 4x = - 8 \\ x = - \frac{8}{4} \implies x = - 2[/tex]

d)

[tex]7x + 21 = 0 \iff 7x = - 21 \\ x = - \frac{21}{7} \implies x = - 3[/tex]