Question

найдите корень уравнения 19 - 5x = -1

Answer 1

19+1=5х
20=5х
5х=20
х=4

Answer 2

19 - 5x = -1
-5x = -1 -19
-5x = -20
   x= -20 : -5
   x= 4
Проверка
19 - 5x4 = -1
19 - 20 = -1