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x in (-oo:+oo)
2/5 = (3/10)*x // - (3/10)*x
2/5-((3/10)*x) = 0
(-3/10)*x+2/5 = 0
2/5-3/10*x = 0 // - 2/5
-3/10*x = -2/5 // : -3/10
x = -2/5/(-3/10)
x = 4/3
x = 4/3
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