Найдите корни уравнения : (6 класс) 2 х-5=х+1 7 (х+6) = 4 (5 х+4) 1/6 (х+9) = - 1/3 х 3 (х-5) = х+3 1,5 (х+8) = - 4 х+1 3/4 (х+8) = 2 х+1

1) 2x - 5 = x + 1

2x - x = 1 + 5

x = 6

2) 7 (x + 6) = 4 (5x + 4)

7x + 42 = 20x + 16

42 - 16 = 20x - 7x

13x = 26

x = 26/13

x = 2

3) 1/6 (x + 9) = - 1/3x

1/6x + 9/6 = - 1/3x

1/6x - (-1/3x) = 9/6

1/6x + 2/6x = 9/6

3/6x = 9/6

x = 9/6 * 6/3

x = 54/18

x = 3

4) 3 (х - 5) = х + 3

3x - 15 = x + 3

3x - x = 3 + 15

2x = 18

x = 18/2

x = 9

5) 1,5 (х + 8) = - 4 х + 1

1,5x + 12 = - 4x + 1

1,5x + 4x = 1 - 12

5,5x = - 11

x = - 11/5,5

x = - 2

6) 3/4 (х + 8) = 2 х + 1

3/4x + 24/4 = 2x + 1

3/4x + 6 = 2x + 1

6 - 1 = 2x - 3/4x

5/4x = 5

x = 5 * 4/5

x = 20/5

x = 4