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j in (-oo:+oo)
13-(-15*(108/9))-(108*0.25^-15)+25+280 = j // - j
13-j-(-15*(108/9))-(108*0.25^-15)+25+280 = 0
13-j-108*0.25^-15+25+180+280 = 0
-j-115964116494 = 0 // + 115964116494
-j = 115964116494 // * -1
j = -115964116494
j = -115964116494
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