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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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