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x in (-oo:+oo)
(-3/5)*x = 9/5 // - 9/5
(-3/5)*x-(9/5) = 0
(-3/5)*x-9/5 = 0
-3/5*x-9/5 = 0 // + 9/5
-3/5*x = 9/5 // : -3/5
x = 9/5/(-3/5)
x = -3
x = -3
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