Section 9. This chapter shall be construed liberally for the accomplishment of its purposes, and any law inconsistent with any provision of this chapter shall not apply, but nothing contained in this chapter shall be deemed to repeal any provision of any other law of this commonwealth relating to discrimination; but, as to acts declared unlawful by section 4, the administrative procedure provided in this chapter under section 5 shall, while pending, be exclusive; and the final determination on the merits shall exclude any other civil action, based on the same grievance of the individual concerned.