Решите уравнения! 5 х+7+2 х+14=42, 16+3 х+2+х=38, 3 х+12-х-1=53, 9 х+55+х-15=130,19 х+25-2 х+9=34

1) 5 х + 7 + 2 х + 14 = 42;

5 х + 2 х = 42 - 7 - 14;

(5 + 2) * x = 42 - 7 - 14;

7 * x = 42 - 7 - 14;

7x = 42 - 7 - 14;

7x = 35 - 14;

7x = 21;

x = 21 : 7;

x = 3.

2) 16 + 3 х + 2 + х = 38;

3x + x = 38 - 16 - 2;

4x = 38 - 16 - 2;

4x = 22 - 2;

4x = 20;

x = 20 : 4;

x = 5.

3) 3 х + 12 - х - 1 = 53;

3x - x = 53 - 12 + 1;

2x = 53 - 12 + 1;

2x = 54 - 12;

2x = 42;

x = 42 : 2;

x = 21.

4) 9 х + 55 + х - 15 = 130;

9x + x = 130 - 55 + 15;

10x = 130 - 55 + 15;

10x = 145 - 55;

10x = 90;

x = 90 : 10;

x = 9.

5) 19 х + 25 - 2 х + 9 = 34;

19x - 2x = 34 - 25 - 9;

17x = 34 - 25 - 9;

17x = 34 - 34;

17x = 0;

x = 0.