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