а) x-10-2 = x - 12б) 12-b-3 = 9 - bв) 10-y-10 = -y
г) x-y-z+y = x - zд) x+y+x+x-y = 3xе) a-1+a-1+a1 = 2a - 1
а) x-10-2 = x - 12
б) 12-b-3 = 9 - b
в) 10-y-10 = -y
г) x-y-z+y = x - z
д) x+y+x+x-y = 3x
е) a-1+a-1+a1 = 2a - 1