Verified answer

Ответ:

Пошаговое объяснение:

4(x - 2) = -5x

4x - 8 = -5x

5x + 4x = 8

9x = 8

x = 8:9

x = 8/9

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-(4x - 7) = -7x

-4x + 7 = -7x

7x - 4x = -7

3x = -7

x = -7 : 3

x = -2цел. 1/3

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-6(x - 1) = 13

-6x + 6 = 13

-6x = 13-6

-6x = 7

x = -7 : 6

x = -1цел. 1/6

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2(x + 1) = 9(x - 3)

2x + 2 = 9x - 27

9x - 2x = 2 + 27

7x = 29

x = 29 : 7

x = 4цел. 1/7

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3,2(2 - 3y)=3(0,8y-1)+3,4

6,4 - 9,6y = 2,4y - 3 + 3,4

6,4 - 9,6y = 2,4y + 0,4

2,4y+9,6y = 6,4 - 0,4

12y = 6

y = 6 : 12

y = 0,5

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3(0,4x + 7) - 4(0,8x - 3) = 2

1,2x + 21 - 3,2x + 12 = 2

-2x + 33 = 2

2x = 33 - 2

2x = 31

x = 31:2

x = 15,5

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0,77(8/11x - 3/7) - 4,5(7/15x + 2/9) = 1,75

77/100*(8/11x - 3/7) - 45/10*(7/15x + 2/9) = 1,75

14/25x - 33/100 - 21/10x - 1 = 1,75

28/50x - 1 33/100 - 105/50 = 1,75

-77/50x - 1 33/100 = 1,75

-77/50x = 1,75 + 1 33/100

-77/50x = 1 75/100 + 1 33/100

-77/50x = 2 108/100

x = 2 108/100 : (-77/50)

x = 308/100 * (-50/77)

x = -4/2 = -2