Answer:
The value of x = 12
Step-by-step explanation:
Given
As AC is the sum of AB and BC i.e.
substituting AC = x+51, AB = x+5, BC = 3x+10
AC = AB+BC
x+51 = x+5 + 3x+10
x+51 = 4x+15
switching sides
4x+15 = x+51
4x-x = 51-15
3x = 36
Divide both sides by 3
3x/3 = 36/3
x = 12
Therefore, the value of x = 12
