Question

і. 4х – 8 = 0
1. 7x – 28 = 0​

Answer 1

Respuesta:

) 7х = -30 + 2х;

7х - 2x = - 30

5x = - 30

x = - 6

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5) 0,2х + 4,3 = 0,4х - 6,5;

0,4x - 0,2x = 4,3 + 6,5

0,2x = 10,8

x = 54

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2) 16 - 18х = -25x - 12;

25x - 18x = - 12 - 16

7x = - 28

x = - 4

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6) 0,6х + 100 = 0,9x + 1;

0,9x - 0,6x = 100 - 1

0,3x = 99

x = 330

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3) -17х + 20 = 7х - 28;

7x + 17x = 20 + 28

24x = 48

x = 2

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7) -9/14 х + 18 =-2/3 х + 17;

- 9/14x + 2/3x = 17 - 18

- 27/42x + 28/42x = - 1

1/42x = - 1

x = - 42

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4) 20 - 2х = 27 + х;

x + 2x = 20 - 27

3x = - 7

x = - 7/3

x = - 2 1/3

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8) -8/15 х -11 = 4/9 х + 11.

- 8/15x - 4/9x = 11 + 11

- 24/45x - 20/45x = 22

- 44/45x = 22

x = 22 : ( - 44/45 )

x = - 45/2

x = - 22 1/2