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x in (-oo:+oo)
X-((1/4)*(2*k+15)) = 3/4 // - 3/4
X-((1/4)*(2*k+15))-(3/4) = 0
(-1/4)*(2*k+15)+X-3/4 = 0
X-1/4*(2*k+15)-3/4 = 0
(-1/4*4*(2*k+15))/4+(4*X)/4-3/4 = 0
4*X-1/4*4*(2*k+15)-3 = 0
4*X-2*k-15-3 = 0
4*X-2*k-18 = 0
(4*X-2*k-18)/4 = 0
(4*X-2*k-18)/4 = 0 // * 4
4*X-2*k-18 = 0
x belongs to the empty set
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