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Which equation can be used to solve for x in the following diagram?

Which equation can be used to solve for x in the following diagram?-example-1
User CBono
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1 Answer

6 votes
i think 3x+12+x=180
because it is a supplementary angle and those equal 180
the sum of both sides on the straight line make 180

and if you were to solve it
it would be
= 42
User TMann
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