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k in (-oo:+oo)
4*(2*k+7) = 60 // - 60
4*(2*k+7)-60 = 0
4*(2*k+7)-60 = 0
8*k-32 = 0
8*k-32 = 0
8*k-32 = 0 // + 32
8*k = 32 // : 8
k = 32/8
k = 4
k = 4
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