Is means equal
x percent is x/100
of means multiplication
So translating what you were given:

Solve for x

Simplify it

Multiply both sides by 5/3 to isolate x

Your final answer is
Answer: The answer is 40 degrees
Step-by-step explanation: Angles CDE and ABC are congruent and the sum of the other angles together is 140 degrees. Since all triangles add up to 180 degrees 40 degrees is left.
Answer:
the
Step-by-step explanation:
the comen factor are 10-15+20-30
and Factor the entire expression completely.
are n and 2