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x in (-oo:+oo)
x/(-3) = -3/5 // + -3/5
x/(-3)-(-3/5) = 0
x/(-3)+3/5 = 0
3/5-1/3*x = 0 // - 3/5
-1/3*x = -3/5 // : -1/3
x = -3/5/(-1/3)
x = 9/5
x = 9/5
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