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x in (-oo:+oo)
-((3/5)*x) = 9/20 // - 9/20
-((3/5)*x)-(9/20) = 0
(-3/5)*x-9/20 = 0
-3/5*x-9/20 = 0 // + 9/20
-3/5*x = 9/20 // : -3/5
x = 9/20/(-3/5)
x = -3/4
x = -3/4
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