Answer:
mueva la variable al lado izquierdo y cambie su signo, (5 + 2x-5x = -7)
Reúna términos semejantes (-3x = -7-5), luego divida ambos lados de la ecuación por -3
Entonces obtienes x = 4
In english:
Answer: x=4
move the variable to the left side and change its sign, (5 + 2x-5x = -7)
Collect like terms (-3x = -7-5), then divide both sides of the equation by -3
So you get x = 4