7 Miles Per Hour Is The Answer.
There is no single solution but there is a group of solutions also known as the interval.

This can be written with an interval.

Hope this helps.
r3t40
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As they are vertical angles, their magnitude would be equal.
x = 3x - 60
3x - x = 60
2x = 60
x= 30
In short, Your Answer would be 30
Hope this helps!
It would be x + y + 64
You subtract the -x from the 2x