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k in (-oo:+oo)
2-(3*k) = k-30 // - k-30
2-(3*k)-k+30 = 0
2-3*k-k+30 = 0
32-4*k = 0 // - 32
-4*k = -32 // : -4
k = -32/(-4)
k = 8
k = 8
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