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k in (-oo:+oo)
(4/5)*k-k-(1/2) = (1/10)*(k+2) // - (1/10)*(k+2)
(4/5)*k-((1/10)*(k+2))-k-(1/2) = 0
(-1/10)*(k+2)+(4/5)*k-k-1/2 = 0
(4*k)/5-1/10*(k+2)-k-1/2 = 0
(-1/10*2*5*(k+2))/(2*5)+(2*4*k)/(2*5)+(2*5*(-k))/(2*5)+(-1*5)/(2*5) = 0
2*4*k-1/10*2*5*(k+2)+2*5*(-k)-1*5 = 0
7*k-10*k-5-2 = 0
-3*k-5-2 = 0
-3*k-7 = 0
(-3*k-7)/(2*5) = 0
(-3*k-7)/(2*5) = 0 // * 2*5
-3*k-7 = 0
-3*k-7 = 0 // + 7
-3*k = 7 // : -3
k = 7/(-3)
k = -7/3
k = -7/3
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