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x in (-oo:+oo)
(-3/5)*x = 12/15 // - 12/15
(-3/5)*x-(12/15) = 0
(-3/5)*x-4/5 = 0
-3/5*x-4/5 = 0 // + 4/5
-3/5*x = 4/5 // : -3/5
x = 4/5/(-3/5)
x = -4/3
x = -4/3
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