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k in (-oo:+oo)
-(4*k)-4/9 = 7*k+62/9 // - 7*k+62/9
-(4*k)-(7*k)-4/9-(62/9) = 0
-4*k-7*k-4/9-62/9 = 0
-11*k-22/3 = 0 // + 22/3
-11*k = 22/3 // : -11
k = 22/3/(-11)
k = -2/3
k = -2/3
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