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x in (-oo:+oo)
120 = (8/5)*x // - (8/5)*x
120-((8/5)*x) = 0
(-8/5)*x+120 = 0
120-8/5*x = 0 // - 120
-8/5*x = -120 // : -8/5
x = -120/(-8/5)
x = 75
x = 75
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