I need help with the questions below

The values of x are -12, 11, -9 and -9/2
Question 6
Here, we have:
AC =13
BC = x + 18
AB = 19 + x
Given that the points A, B and C are collinear points, where point B is between points A and B.
This means that
AC = AB + BC
So, we have
19 + x + x + 18 = 13
Evaluate the like terms
37 + 2x = 13
Evaluate the like terms
2x = -24
Divide by 2
x = -12
Hence, the value of x is -12
Question 7
Here, we have:
AC = 3x - 11
BC = 10
AB = 2x - 10
Given that the points A, B and C are collinear points, where point B is between points A and B.
This means that
AC = AB + BC
So, we have
2x - 10 + 10 = 3x - 11
Evaluate the like terms
2x = 3x - 11
Evaluate the like terms
-x = -11
Divide by -1
x = 11
Hence, the value of x is 11
Question 9
Here, we have:
AC = x + 19
BC = 10
AB = 2x + 9
Given that the points A, B and C are collinear points, where point B is between points A and B.
This means that
AC = AB + BC
So, we have
2x + 9 + x + 19= x + 19
Evaluate the like terms
3x + 28 = x + 19
Evaluate the like terms
2x = -9
Divide by 2
x = -9/2
Hence, the value of x is -9/2
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