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2) 300 - х * 5 = 210

4) (300 - х) * 5 = 210

5) (300 - 18) * х = 1410

6) (150 - 20) : х = 65

7) 5 * х - 600 = 900

8) (х + 4) * 7 = 350

2) 300 - х*5 = 210;

- х*5 = 210 - 300;

- х*5 = - 90;

х = - 90 / (-5).

х = 18.

4) (300 - х) * 5 = 210.

(300 - х) * 5/5 = 210/5;

300 - х = 42;

- х = 42 - 300;

х = - 258 / (-1) ;

х = 258.

5) (300 - 18) * х = 1410;

282*х = 1410;

х = 1410/282;

х = 5.

6) (150 - 20) : х = 65;

130:х = 65.

х = 130/65;

х = 2.

7) 5*х - 600 = 900;

5*х = 900 + 600;

5*х = 1500;

х = 1500/5;

х = 300.

8) (х + 4) * 7 = 350;

(х + 4) * 7/7 = 350/7;

х + 4 = 50;

х = 50 - 4;

х = 46.