Найдите корень уравнения: a) 34 - (x - 7) = 18; б) (x + 24) - 15 = 12; в) (56 – x) + 34 = 72; г) 62 + (15 + x) = 148.

Решение:

а) 34 - (x - 7) = 18

34 - x + 7 = 18

41 - x = 18

x = 41 - 18

x = 23

б) (x + 24) - 15 = 12

x + 24 = 12 + 15

x + 24 = 27

x = 27 - 24

x = 3

в) (56 – x) + 34 = 72

56 - x = 72 - 34

56 - x = 38

x = 56 - 38

x = 18

г) 62 + (15 + x) = 148

15 + x = 148 - 62

15 + x = 86

x = 86 - 15

x = 71