Restar resultados de 2 selects

[huesos52]

Código SQL:

SELECT c1.totalvehi-c2.total 
FROM
(
 SELECT COUNT(id_vehiculo) AS TotalVehi 
 FROM vehiculos WHERE id_estado = 14 
 AND id_local = 2
) AS c1,
(
 SELECT COUNT(tareas.id_tipo_tarea)AS Total 
 FROM vehiculos,tareas,tipos_tarea WHERE 
 Vehiculos.id_vehiculo = tareas.id_vehiculo AND  
 tareas.id_tipo_tarea = tipos_tarea.id_tipo_tarea 
 AND vehiculos.id_estado = 14 AND 
 tareas.finalizada = 0 AND vehiculos.id_local = 2
) AS c2;
 

así?

No lo he probado