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x in (-oo:+oo)
(-3/5)*x = 9/4 // - 9/4
(-3/5)*x-(9/4) = 0
(-3/5)*x-9/4 = 0
-3/5*x-9/4 = 0 // + 9/4
-3/5*x = 9/4 // : -3/5
x = 9/4/(-3/5)
x = -15/4
x = -15/4
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