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k in (-oo:+oo)
-89 = 7*k+4*k+10 // - 7*k+4*k+10
-(7*k)-(4*k)-89-10 = 0
-7*k-4*k-89-10 = 0
-11*k-99 = 0 // + 99
-11*k = 99 // : -11
k = 99/(-11)
k = -9
k = -9
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