Question

Б) -2(х – 7) - 11 +7(3х + 6) + 5(х – 3)=0

Answer 1

Объяснение:

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Последние две строчки не верные

24х=-30

Х=-5/4

Answer 2

Ответ:

х= -1,25

Объяснение:

-2(х – 7) - 11 +7(3х + 6) + 5(х – 3)=0

-2х +14  - 11 + 21х + 42 + 5х – 15 =0

-2х + 21х  + 5х =-14  + 11 - 42 +  15  

24х = -30

х= - ³⁰/₂₄ = - ⁵/₄= -1,25

проверка

-2(-1,25 – 7) - 11 +7(-3·1,25 + 6) + 5(-1,25 – 3)=0

-2(-8,25) - 11 +7(-3,75 + 6) + 5(-4,25)=0

16,5 -11 +7·2,25 -21,25 =0

5,5 +15,75 -21,25 =0

21,25 -2125 =0

0 = 0

 

Answer 3

To solve the equation -2(x - 7) - 11 + 7(3x + 6) + 5(x - 3) = 0, we will simplify the equation and then solve for x.

Let's simplify the equation step by step:

-2(x - 7) - 11 + 7(3x + 6) + 5(x - 3) = 0

Expanding the brackets:

-2x + 14 - 11 + 21x + 42 + 5x - 15 = 0

Combining like terms:

24x + 30 = 0

Subtracting 30 from both sides:

24x = -30

Dividing both sides by 24:

x = -30/24

Simplifying the fraction:

x = -5/4

Therefore, the solution to the equation -2(x - 7) - 11 + 7(3x + 6) + 5(x - 3) = 0 is x = -5/4.