(7y − 4)(2y + 3) − 13y = (14y2 + 21y − 8y − 12) − 13y = 14y2 + 21y − 8y − 12 − 13y = 14y2 − 12
(7y-4)(2y + 3)-13y = (14y2 + 21y-8y-12)-13y = 14y2 + 21y-8y-12-13y = 14y2-12
(7y − 4)(2y + 3) − 13y = (14y2 + 21y − 8y − 12) − 13y = 14y2 + 21y − 8y − 12 − 13y = 14y2 − 12
(7y-4)(2y + 3)-13y = (14y2 + 21y-8y-12)-13y = 14y2 + 21y-8y-12-13y = 14y2-12