Semplifica le seguenti espressioni.
(a+3b−c)+(a−2b−c)+(a−4b)(a+3b-c)+(a-2b-c)+(a-4b)(a+3b−c)+(a−2b−c)+(a−4b)
a+3b−c+a−2b−c+a−4ba+3b-c+a-2b-c+a-4ba+3b−c+a−2b−c+a−4b === (a+a+a)+(3b−2b−4b)+(−c−c)(a+a+a)+(3b-2b-4b)+(-c-c)(a+a+a)+(3b−2b−4b)+(−c−c) === 3a+(−3b)+(−2c)3a+(-3b)+(-2c)3a+(−3b)+(−2c) === 3a−3b−2c3a-3b-2c3a−3b−2c