Ответы и объяснения

2012-12-04T15:59:14+04:00

28z + 63 + 35t + 8z -12 - 20t = 15t + 36z + 51

 uли 

28z + 63 + 35t + 8z -12 - 20t = 4z( 7 + 2 ) + 5t( 7 - 4 ) + 3( 21 - 4 ) = 4z * 9 + 5t * 3 + 3 * 17 = 15t + 36z + 51