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k in (-oo:+oo)
(2/5)*(k+10) = (2/3)*k // - (2/3)*k
(2/5)*(k+10)-((2/3)*k) = 0
(2/5)*(k+10)+(-2/3)*k = 0
2/5*(k+10)+(-2*k)/3 = 0
(2/5*3*(k+10))/3+(-2*k)/3 = 0
2/5*3*(k+10)-2*k = 0
12-4/5*k = 0
(12-4/5*k)/3 = 0
(12-4/5*k)/3 = 0 // * 3
12-4/5*k = 0
12-4/5*k = 0 // - 12
-4/5*k = -12 // : -4/5
k = -12/(-4/5)
k = 15
k = 15
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