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x in (-oo:+oo)
-23/4 = (-2/5)*x-((1/2)*x)-5 // - (-2/5)*x-((1/2)*x)-5
(1/2)*x-((-2/5)*x)-23/4+5 = 0
(2/5)*x+(1/2)*x-23/4+5 = 0
9/10*x-3/4 = 0 // + 3/4
9/10*x = 3/4 // : 9/10
x = 3/4/9/10
x = 5/6
x = 5/6
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