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a in (-oo:+oo)
4/5-(3*a)+5 = 7-((2*a)/2) // - 7-((2*a)/2)
(2*a)/2-(3*a)+4/5-7+5 = 0
(2*a)/2-3*a+4/5-7+5 = 0
-2*a-6/5 = 0 // + 6/5
-2*a = 6/5 // : -2
a = 6/5/(-2)
a = -3/5
a = -3/5
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