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x in (-oo:+oo)
(-3/5)*x = 3/10 // - 3/10
(-3/5)*x-(3/10) = 0
(-3/5)*x-3/10 = 0
-3/5*x-3/10 = 0 // + 3/10
-3/5*x = 3/10 // : -3/5
x = 3/10/(-3/5)
x = -1/2
x = -1/2
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