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k in (-oo:+oo)
(-3/4)*(k-20) = -7 // + 7
(-3/4)*(k-20)+7 = 0
7-3/4*(k-20) = 0
7-3/4*(k-20) = 0
22-3/4*k = 0
22-3/4*k = 0
22-3/4*k = 0 // - 22
-3/4*k = -22 // : -3/4
k = -22/(-3/4)
k = 88/3
k = 88/3
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