Answer:
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Step-by-step explanation:
We are given:
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Factor:

Difference of Two Squares:
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Zero Product Property:

Solve:
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Take the square root. Since we are taking an even-root, it requires plus/minus:
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ok what do you want me to do for you
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Answer:
6.5
Step-by-step explanation:
If the original angle is x degrees then its supplement is 180 - x degrees.
we have the equation:-
180 - x = 3x + 20
160 = 4x
x = 40
The original angle is 40 degrees and its supplement is 140 degrees