Rozwiąż równania: a)x+8=20 b)y-16=50 c)70-z=69 d)15+c=15

a) x + 8 = 20 x = 20-8 x = 12 b) y - 16 = 50 y = 50 + 16 y = 66 c) 70 - z = 69 -z = 69 - 70 -z = -1 z = 1 d) 15 + c = 15 c = 15 - 15 c = 0