Question

A)X+(x-5)=15 в)x+(x+9)=31 б)x+3x=20 г)7x-x=12

Answer 1

Ответ:

а) х = 10

в) х = 11

б) х = 5

г) х = 2

Пошаговое объяснение:

а) 2х = 20; х = 10

в) 2х = 22; х = 11

б) 4х = 20; х = 5

г) 6х = 12; х = 2

Answer 2

Let's solve each equation step-by-step:

A) X + (X - 5) = 15

First, let's simplify the equation by combining like terms:

2X - 5 = 15

Now, let's isolate X by moving the constant term (-5) to the other side of the equation by adding 5 to both sides:

2X = 15 + 5 2X = 20

Finally, divide both sides by 2 to solve for X:

X = 20 / 2 X = 10

So, the solution for A) is X = 10.

B) X + (X + 9) = 31

Again, let's simplify the equation by combining like terms:

2X + 9 = 31

Next, isolate X by moving the constant term (9) to the other side of the equation by subtracting 9 from both sides:

2X = 31 - 9 2X = 22

Finally, divide both sides by 2 to solve for X:

X = 22 / 2 X = 11

The solution for B) is X = 11.

C) X + 3X = 20

In this equation, we need to combine the coefficients of X:

4X = 20

Now, isolate X by dividing both sides by 4:

X = 20 / 4 X = 5

The solution for C) is X = 5.

D) 7X - X = 12

In this equation, we need to combine the coefficients of X:

6X = 12

Now, isolate X by dividing both sides by 6:

X = 12 / 6 X = 2

The solution for D) is X = 2.

To summarize: A) X = 10 B) X = 11 C) X = 5 D) X = 2