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k in (-oo:+oo)
1-(4*k)-(3*k) = 36 // - 36
1-(4*k)-(3*k)-36 = 0
1-4*k-3*k-36 = 0
-7*k-35 = 0 // + 35
-7*k = 35 // : -7
k = 35/(-7)
k = -5
k = -5
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