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x in (-oo:+oo)
(-3/5)*x = 12/10 // - 12/10
(-3/5)*x-(12/10) = 0
(-3/5)*x-6/5 = 0
-3/5*x-6/5 = 0 // + 6/5
-3/5*x = 6/5 // : -3/5
x = 6/5/(-3/5)
x = -2
x = -2
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