-3.
Coefficients are numbers that have a variable next to it, thus leading it to be -e of the -3x.
Hope this helps!
7 different ways is the answer
Answer:

Step-by-step explanation:
we know that
An exterior angle of a triangle is equal to the sum of the opposite interior angles.
see the attached figure to better understand the problem
so
∠DEF=∠ECD+∠CDE
substitute the given values

solve for x
Combine like terms

Group terms



Find the measure of angle CDE

substitute the value of x

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Answer:
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Step-by-step explanation: