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Collect like terms


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<em>Choice-A</em> is the answer to this math problem.
The supplement of 30° is the angle that when added to 30° forms a straight angle (180° ).
What? Can you attach a photo?
Answer:
k = -5
Step-by-step explanation:
The variable is k
9k + 1 = -9 + 7k
-7k -1
2k = -10
2k/2 -10/2
k = -5
:)