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k in (-oo:+oo)
(-2/3)*(k+2/5) = 5/6 // - 5/6
(-2/3)*(k+2/5)-(5/6) = 0
(-2/3)*(k+2/5)-5/6 = 0
-2/3*(k+2/5)-5/6 = 0
(-2/3*6*(k+2/5))/6-5/6 = 0
-2/3*6*(k+2/5)-5 = 0
-4*k-33/5 = 0
(-4*k-33/5)/6 = 0
(-4*k-33/5)/6 = 0 // * 6
-4*k-33/5 = 0
-4*k-33/5 = 0 // + 33/5
-4*k = 33/5 // : -4
k = 33/5/(-4)
k = -33/20
k = -33/20
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