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x in (-oo:+oo)
3-((2/5)*x) = 1/5 // - 1/5
3-((2/5)*x)-(1/5) = 0
(-2/5)*x-1/5+3 = 0
14/5-2/5*x = 0 // - 14/5
-2/5*x = -14/5 // : -2/5
x = -14/5/(-2/5)
x = 7
x = 7
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