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a in (-oo:+oo)
3/4-2*a-((4/5)*a) = -53/4 // + -53/4
3/4-2*a-((4/5)*a)-(-53/4) = 0
(-4/5)*a-2*a+3/4+53/4 = 0
14-14/5*a = 0 // - 14
-14/5*a = -14 // : -14/5
a = -14/(-14/5)
a = 5
a = 5
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