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X in (-oo:+oo)
X/12 = 900/30 // - 900/30
X/12-(900/30) = 0
X/12-30 = 0
1/12*X-30 = 0 // + 30
1/12*X = 30 // : 1/12
X = 30/1/12
X = 360
X = 360
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