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