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x in (-oo:+oo)
(-3/5)*x = 9/50 // - 9/50
(-3/5)*x-(9/50) = 0
(-3/5)*x-9/50 = 0
-3/5*x-9/50 = 0 // + 9/50
-3/5*x = 9/50 // : -3/5
x = 9/50/(-3/5)
x = -3/10
x = -3/10
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