5.124 Решите уравнение: a) -5(-y + 9) = y + 10; б) m-17= (m + 4)(-9); в) 17-4(m + 11) = 43; г) -7(4x + 2) - 3 = -17; д) -4,8у + 7,2 = 3(2,4y + 4,8); e) -5(0,6у - 1,8) = -2y + 8,5.

a) 5y - 45 = y + 10 => 4y = 55 => y = 13.75.
б) m - 17 = -9m - 36 => 10m = -19 => m = -1.9.
в) 17 - 4m - 44 = 43 => -4m - 27 = 43 => -4m = 70 => m = -17.5.
г) -28x - 14 - 3 = -17 => -28x - 17 = -17 => -28x = 0 => x = 0.
д) -4.8y + 7.2 = 7.2y + 14.4 => 7.2 - 14.4 = 7.2y + 4.8y => -7.2 = 12y => y = -0.6.
e) -3y + 9 = -2y + 8.5 => 9 - 8.5 = -2y + 3y => 0.5 = y.