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x in (-oo:+oo)
-((2/5)*x)-3/10 = 1/5 // - 1/5
-((2/5)*x)-3/10-(1/5) = 0
(-2/5)*x-3/10-1/5 = 0
-2/5*x-1/2 = 0 // + 1/2
-2/5*x = 1/2 // : -2/5
x = 1/2/(-2/5)
x = -5/4
x = -5/4
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