Question

Помогите редите уравнение (линейное)
(5x-240)-(x-80)=320

Answer 1

5x-240-x+80=320
4x=320+240-80
4x=560-80
4x=480
x=120

Answer 2

$(5x-240)-(x-80)=320\\ 5x - x -240+80 = 320\\ 4x-160=320\\ 4x=320+160\\ 4x=480\\ x = 120$

Проверка:
$x = 120\\ (5*120-240)-(120-80)=(600-240)-40=360-40=320$