Question

el valor de la icognita x en la ecuacion 5x+2=3x+10

Answer 1

5x + 2 = 3x + 10
5x = 3x + 10 - 2 
5x = 3x + 8
5x - 3x = 8
2x = 8
x = 8 : 2
x = 4

Comprobamos:
5x + 2 = 3x + 10
5 . 4 + 2 = 3 . 4 + 10
20 + 2 = 12 + 10
22 = 22 

Entonces, x = 4