1) 2x=18-x; 2) 7x+3=30-2x; 3) 7-2x=3x-18; 4) 0,2x+2,7-1,4-1,1x; 5) 5,4-1,5x=0,3x-3,6; 6) x+15=x+10.​

Ответ:

2x + x = 18

3x = 18

x = 6

7x + 2x = 30 - 3

9x = 27

x = 3

7 + 18 = 3x + 2x

25 = 5x

x = 5

0.2x - 1.1x + 2.7 - 1.4 = -0.9x + 1.3

5.4 - 1.5x = 0.3x - 3.6

1.8x = 9

x = 5

x + 15 = x + 10

15 = 10