Решение:

1) 5 + 4x = 6 + 3x

\( 4x - 3x = 6 - 5 \)

\( x = 1 \)

2) 5x - 3 = 3x + 1

\( 5x - 3x = 1 + 3 \)

\( 2x = 4 \)

\( x = 2 \)

3) -8 + 2x = x - 5

\( 2x - x = -5 + 8 \)

\( x = 3 \)

4) 9 - 3x = 1 + x

\( -3x - x = 1 - 9 \)

\( -4x = -8 \)

\( x = 2 \)

5) 6x - 7 = 8 + 3x

\( 6x - 3x = 8 + 7 \)

\( 3x = 15 \)

\( x = 5 \)

6) 4x - 2 = 10 + 2x

\( 4x - 2x = 10 + 2 \)

\( 2x = 12 \)

\( x = 6 \)

7) 3 - 4x = 17 - 6x

\( -4x + 6x = 17 - 3 \)

\( 2x = 14 \)

\( x = 7 \)

8) 9x - 1 = 8x + 7

\( 9x - 8x = 7 + 1 \)

\( x = 8 \)

9) 4x - 6 = 2x + 12

\( 4x - 2x = 12 + 6 \)

\( 2x = 18 \)

\( x = 9 \)

10) 3x + 3 = 2x + 13

\( 3x - 2x = 13 - 3 \)

\( x = 10 \)

11) 9 - 3x = 20 - 4x

\( -3x + 4x = 20 - 9 \)

\( x = 11 \)

12) 7x - 1 = 5x + 23

\( 7x - 5x = 23 + 1 \)

\( 2x = 24 \)

\( x = 12 \)

13) 2 - 3x = 28 - 5x

\( -3x + 5x = 28 - 2 \)

\( 2x = 26 \)

\( x = 13 \)

14) 6x + 3 = 5x + 17

\( 6x - 5x = 17 - 3 \)

\( x = 14 \)

15) 8x - 10 = 6x + 20

\( 8x - 6x = 20 + 10 \)

\( 2x = 30 \)

\( x = 15 \)

16) 17x - 1 = 15 + 16x

\( 17x - 16x = 15 + 1 \)

\( x = 16 \)

17) 19 + 3x = 5x - 15

\( 3x - 5x = -15 - 19 \)

\( -2x = -34 \)

\( x = 17 \)

18) 6 + 2x = 4x - 30

\( 2x - 4x = -30 - 6 \)

\( -2x = -36 \)

\( x = 18 \)

19) 5x + 3 = 4x + 22

\( 5x - 4x = 22 - 3 \)

\( x = 19 \)

20) 2 + 2x = x + 24

\( 2x - x = 24 - 2 \)

\( x = 22 \)

21) 5 + 7x = 26 + 6x

\( 7x - 6x = 26 - 5 \)

\( x = 21 \)

Ответ: 1) 1; 2) 2; 3) 3; 4) 2; 5) 5; 6) 6; 7) 7; 8) 8; 9) 9; 10) 10; 11) 11; 12) 12; 13) 13; 14) 14; 15) 15; 16) 16; 17) 17; 18) 18; 19) 19; 20) 22; 21) 21.

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