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K in (-oo:+oo)
180 = (144*K)/4 // - (144*K)/4
180-((144*K)/4) = 0
180-36*K = 0
180-36*K = 0 // - 180
-36*K = -180 // : -36
K = -180/(-36)
K = 5
K = 5
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