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x in (-oo:+oo)
180-x = (1/3)*x // - (1/3)*x
180-x-((1/3)*x) = 0
(-1/3)*x-x+180 = 0
180-4/3*x = 0 // - 180
-4/3*x = -180 // : -4/3
x = -180/(-4/3)
x = 135
x = 135
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