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x in (-oo:+oo)
4 = (120/2)*x // - (120/2)*x
4-((120/2)*x) = 0
4-60*x = 0
4-60*x = 0 // - 4
-60*x = -4 // : -60
x = -4/(-60)
x = 1/15
x = 1/15
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