Question

Если x=0,5; 12(x+3)=5x-21=

Answer 1

12*0,5+36=5*0,5-21
Ответ:60,5

Answer 2

12(0,5+3)=5х0,5-21
6+36=2,5-21
42=-18.5

Answer 3

There seems to be an error in the equation you provided.

12(x+3)=5x-21

This equation has two equal signs, which is not possible in a mathematical equation. It's either missing an operator between the two equations or there's a typo.

Assuming you meant to write two separate equations, we can solve for x in each equation and see if x=0.5 is a solution to both.

First equation:

12(x+3) = 5x - 21

Distribute the 12:

12x + 36 = 5x - 21

Subtract 5x from both sides:

7x + 36 = -21

Subtract 36 from both sides:

7x = -57

Divide by 7:

x = -57/7

Therefore, x = -8.14, not 0.5. Therefore, x=0.5 is not a solution to the first equation.

Second equation:

5x - 21 = 0

Add 21 to both sides:

5x = 21

Divide by 5:

x = 4.2

Therefore, x = 4.2, not 0.5. Therefore, x=0.5 is not a solution to the second equation either.

In conclusion, there is no solution to the system of equations given with x=0.5.