3. Реши уравнения: а) 540 : (17 - x) = 60; б) y * 7 - 80 = 340; в) (6 + m) * 4 = 72; г) k : 5 + 8 = 27

а) 540 : (17 - x) = 60

17 - x = 540 : 60

17 - x = 9

x = 17 - 9

x = 8

б) y * 7 - 80 = 340

y * 7 = 340 + 80

y * 7 = 420

y = 420 : 7

y = 60

в) (6 + m) * 4 = 72

6 + m = 72 : 4

6 + m = 18

m = 18 - 6

m = 12

г) k : 5 + 8 = 27

k : 5 = 27 - 8

k : 5 = 19

k = 19 * 5

k = 95