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a in (-oo:+oo)
a = 8*5831*(8.31/4+1)^4 // - 8*5831*(8.31/4+1)^4
a-(8*5831*(8.31/4+1)^4) = 0
a-46648*(8.31/4+1)^4 = 0
a-46648*3.0775^4 = 0 // + -46648*3.0775^4
a = -(-46648*3.0775^4)
a = 46648*3.0775^4
a = 46648*3.0775^4
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