(26+x)*5-42=138 Помогите;))))))

(26 + x) × 5 - 42 = 138
(26 + x) × 5 = 138 + 42
(26 + x) × 5 = 180
26 + x = 180 ÷ 5
26 + x = 36
x = 36 - 26
x = 10
Проверка:
(26 + 10) × 5 - 42 = 138
138 = 138