Question

решите уравнения
2х=18-х
7х+3=30-2х
7-2х=3х-18
плиз решите каждый подробно

Answer 1

2x + x = 18
3x = 18
x = 6

7x + 3 = 30 - 2x
7x + 2 x = 30 - 3
9x = 27
x= 3

7 - 2x = 3x - 18
7 + 18 = 2x + 3x
25 = 5x
x = 5