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x in (-oo:+oo)
(1/3)*(180-x) = 0
1/3*(180-x) = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( 180-x )
180-x = 0 // - 180
-x = -180 // * -1
x = 180
x = 180
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