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a in (-oo:+oo)
4-((4/5)*(4*a+3)) = -24 // + 24
4-((4/5)*(4*a+3))+24 = 0
(-4/5)*(4*a+3)+4+24 = 0
4-4/5*(4*a+3)+24 = 0
4-4/5*(4*a+3)+24 = 0
8/5-16/5*a+24 = 0
128/5-16/5*a = 0
128/5-16/5*a = 0
128/5-16/5*a = 0 // - 128/5
-16/5*a = -128/5 // : -16/5
a = -128/5/(-16/5)
a = 8
a = 8
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