Answer:
Step-by-step explanation:

Divide both sides of the equation by 3 to get p by its self.
Commutative Property is used here
Answer:
7
Step-by-step explanation:
a right angle is 90 degrees so
90=76+2x subtract 76 from both sides
-76 -76
________
14=2x divide 2 from both sides
_ ___
2 2
7=x
Check:
76+(2*7)=90 correct