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k in (-oo:+oo)
(1/2)*(13*k-7) = (3/4)*(6*k+2) // - (3/4)*(6*k+2)
(1/2)*(13*k-7)-((3/4)*(6*k+2)) = 0
(1/2)*(13*k-7)+(-3/4)*(6*k+2) = 0
1/2*(13*k-7)-3/4*(6*k+2) = 0
1/2*(13*k-7)-3/4*(6*k+2) = 0
2*k-5 = 0
2*k-5 = 0
2*k-5 = 0 // + 5
2*k = 5 // : 2
k = 5/2
k = 5/2
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