Решите уравнения: а) 15/(7-y) = 5 б) 42/y = 3 в) (12+y)/9 = 3 г) (14+х )/9 = 5 д) y - 13/27 = 10/27 е) 4 1/5 + x = 7 4/5 ж) (8/15 + x) - 7/15 = 11/15 з) x/42 - 5/42 = 35/42
(Это дроби)

а) 15/(7-y) = 5 7-y=15:57-y=3y=7-3y=4б) 42/y = 3 y=42:3y=14в) (12+y)/9 = 3 12+y=3*912+y=27y=27-12y=15г) (14+х )/9 = 5 14+y=5*914+y=45y=45-14y=31д) y - 13/27 = 10/27 y = 10/27 + 13/27y = 23/27е) 4 1/5 + x = 7 4/5 x = 7 4/5 - 4 1/5x = 3 3/5ж) (8/15 + x) - 7/15 = 11/15 8/15 + x - 7/15 = 11/151/15 + x = 11/15x = 11/15 - 1/15x = 10/15x = 2/3з) x/42 - 5/42 = 35/42x/42 = 35/42 + 5/42x/42 = 40/42x = 40/42 * 42x = 40