Question 987966
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Hello,

I slightly corrected your formulation. 
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First angle = x-30


Second angle = x


Third angle = 4x


An equation is


(x-30) + x + 4x = 180.


Solve it:


x - 30 + x + 4x = 180,

6x = 180 + 30,

6x = 210,

x = {{{210/6}}} = 35°.


<B>Answer</B>. &nbsp;35°.