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k in (-oo:+oo)
4*k-10 = -62/5 // + -62/5
4*k-(-62/5)-10 = 0
4*k+62/5-10 = 0
4*k+12/5 = 0 // - 12/5
4*k = -12/5 // : 4
k = -12/5/4
k = -3/5
k = -3/5
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