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a in (-oo:+oo)
a = 15*5831*(8.31/4+1)^4 // - 15*5831*(8.31/4+1)^4
a-(15*5831*(8.31/4+1)^4) = 0
a-87465*(8.31/4+1)^4 = 0
a-87465*3.0775^4 = 0 // + -87465*3.0775^4
a = -(-87465*3.0775^4)
a = 87465*3.0775^4
a = 87465*3.0775^4
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