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k in (-oo:+oo)
k/4 = 175/20 // - 175/20
k/4-(175/20) = 0
k/4-35/4 = 0
1/4*k-35/4 = 0 // + 35/4
1/4*k = 35/4 // : 1/4
k = 35/4/1/4
k = 35
k = 35
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