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k in (-oo:+oo)
2*k+5 = 71/10-5*k // - 71/10-5*k
2*k-(-5*k)-(71/10)+5 = 0
2*k+5*k-71/10+5 = 0
7*k-21/10 = 0 // + 21/10
7*k = 21/10 // : 7
k = 21/10/7
k = 3/10
k = 3/10
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