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a in (-oo:+oo)
a+(1/2)*a+2 = 41 // - 41
a+(1/2)*a-41+2 = 0
3/2*a-39 = 0 // + 39
3/2*a = 39 // : 3/2
a = 39/3/2
a = 26
a = 26
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