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k in (-oo:+oo)
(2*k-3)/(-5) = 7 // - 7
(2*k-3)/(-5)-7 = 0
(2*k-3)/(-5)+(-7*(-5))/(-5) = 0
2*k-7*(-5)-3 = 0
2*k+32 = 0
(2*k+32)/(-5) = 0
(2*k+32)/(-5) = 0 // * -5
2*k+32 = 0
2*k+32 = 0 // - 32
2*k = -32 // : 2
k = -32/2
k = -16
k = -16
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