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x in (-oo:+oo)
2.1 = (x-500)/80 // - (x-500)/80
2.1-((x-500)/80) = 0
(-1*(x-500))/80+2.1 = 0
(-1*(x-500))/80+(2.1*80)/80 = 0
2.1*80-1*(x-500) = 0
668-x = 0
(668-x)/80 = 0
(668-x)/80 = 0 // * 80
668-x = 0
668-x = 0 // - 668
-x = -668 // * -1
x = 668
x = 668
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