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x in (-oo:+oo)
-((2/5)*x)-x-3/5 = 1/5 // - 1/5
-((2/5)*x)-x-3/5-(1/5) = 0
(-2/5)*x-x-3/5-1/5 = 0
-7/5*x-4/5 = 0 // + 4/5
-7/5*x = 4/5 // : -7/5
x = 4/5/(-7/5)
x = -4/7
x = -4/7
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