Question

Решить уравнение:
(21+75:(2Х+13))*5=120

Answer 1

5(21+(75/2x+13))=120
21 + 75/2x+13 = 24
75/2x+13 = 3
6x + 39 = 75
6x = 36
x = 6
Проверка:
5(21+(75/2*6+13))=120
5(21+3)=120
120=120

Answer 2

21+75:(2х+13)=120:5
21+75:(2х+13)=24
75:(2х+13)=24-21
75:(2х+13)=3
2х+13=75:3
2х+13=25
2х=25-13
2х=12
х=12:2
х=6