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a in (-oo:+oo)
41/2 = 2*a-2 // - 2*a-2
41/2-(2*a)+2 = 0
41/2-2*a+2 = 0
45/2-2*a = 0 // - 45/2
-2*a = -45/2 // : -2
a = -45/2/(-2)
a = 45/4
a = 45/4
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