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a in (-oo:+oo)
((a+3)^1)/2 = 5 // - 5
((a+3)^1)/2-5 = 0
(a+3)/2-5 = 0
(a+3)/2+(-5*2)/2 = 0
a-5*2+3 = 0
a-7 = 0
(a-7)/2 = 0
(a-7)/2 = 0 // * 2
a-7 = 0
a-7 = 0 // + 7
a = 7
a = 7
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