(5x+7)(2x-3)-(10x+1)(x-2) 어떻게 하나요?

(5x+7)(2x-3)-(10x+1)(x-2) 어떻게 하나요?

(5x+7) (2x-3) - (10x+1) (x-2)
=10x²-x-21-(10x²-19x-2)
=10x²-x-21-10x² +19x+2
=18x-19