Answer:
12x
Step-by-step explanation:
You can add the like terms (which have x)
5x+7x=12x
Answer:
Step-by-step explanation:
Step-by-step explanation: it's answer is 8
hope it is helpful to you
We know that
In any quadrilateral where the vertices are on the circumference of a circle, the opposite angles add up to

degrees.
So,
in this problem

therefore
the answer is