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k in (-oo:+oo)
-(2*(-((2*k)/5)-4/3))-k = -((36*k)/5)-4/3 // + -((36*k)/5)-4/3
(36*k)/5-(2*(-((2*k)/5)-4/3))-k-(-4/3) = 0
(36*k)/5-2*((-2/5)*k-4/3)-k+4/3 = 0
(36*k)/5-2*(-2/5*k-4/3)-k+4/3 = 0
(-2*3*5*(-2/5*k-4/3))/(3*5)+(3*5*(-k))/(3*5)+(3*36*k)/(3*5)+(4*5)/(3*5) = 0
3*5*(-k)-2*3*5*(-2/5*k-4/3)+3*36*k+4*5 = 0
108*k-3*k+20+40 = 0
105*k+20+40 = 0
105*k+60 = 0
(105*k+60)/(3*5) = 0
(105*k+60)/(3*5) = 0 // * 3*5
105*k+60 = 0
105*k+60 = 0 // - 60
105*k = -60 // : 105
k = -60/105
k = -4/7
k = -4/7
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