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K in (-oo:+oo)
3 = (-1/5)*K-2 // - (-1/5)*K-2
2-((-1/5)*K)+3 = 0
(1/5)*K+2+3 = 0
1/5*K+5 = 0 // - 5
1/5*K = -5 // : 1/5
K = -5/1/5
K = -25
K = -25
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