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k in (-oo:+oo)
8*(1.5*k+5) = (1/4)*(4*k-12) // - (1/4)*(4*k-12)
8*(1.5*k+5)-((1/4)*(4*k-12)) = 0
8*(1.5*k+5)+(-1/4)*(4*k-12) = 0
8*(1.5*k+5)-1/4*(4*k-12) = 0
8*(1.5*k+5)-1/4*(4*k-12) = 0
11*k+43 = 0
11*k+43 = 0
11*k+43 = 0 // - 43
11*k = -43 // : 11
k = -43/11
k = -43/11
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