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x in (-oo:+oo)
(1/5)*x-((5/2)*x)-(2/5) = (1/10)*x-((1/2)*x)+3/5 // - (1/10)*x-((1/2)*x)+3/5
(1/5)*x-((5/2)*x)-((1/10)*x)+(1/2)*x-(2/5)-(3/5) = 0
(1/5)*x+(-5/2)*x+(-1/10)*x+(1/2)*x-2/5-3/5 = 0
-19/10*x-1 = 0 // + 1
-19/10*x = 1 // : -19/10
x = 1/(-19/10)
x = -10/19
x = -10/19
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