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X in (-oo:+oo)
30 = (30/25)*X // - (30/25)*X
30-((30/25)*X) = 0
(-6/5)*X+30 = 0
30-6/5*X = 0 // - 30
-6/5*X = -30 // : -6/5
X = -30/(-6/5)
X = 25
X = 25
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