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x in (-oo:+oo)
3-(5*x) = (3/10)*x+5 // - (3/10)*x+5
3-(5*x)-((3/10)*x)-5 = 0
(-3/10)*x-5*x-5+3 = 0
-53/10*x-2 = 0 // + 2
-53/10*x = 2 // : -53/10
x = 2/(-53/10)
x = -20/53
x = -20/53
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