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x + 30 = 25
x= 25 - 30
x= -5
x + 30 = 25
x = 25 - 30
x = - 5
Respuesta.
x = - 5
VERIFICAMOS.
6x + 30 - 5x = 25
6 (- 5) + 30 - 5 (- 5) = 25
- 30 + 30 + 25 = 25
0 + 25 = 25
25 = 25
La solución es correcta.