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