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