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x in (-oo:+oo)
11800*(x/0.8-1) = 5900 // - 5900
11800*(x/0.8-1)-5900 = 0
11800*(1.25*x-1)-5900 = 0
11800*(1.25*x-1)-5900 = 0
14750*x-17700 = 0
14750*x-17700 = 0
14750*x-17700 = 0 // + 17700
14750*x = 17700 // : 14750
x = 17700/14750
x = 6/5
x = 6/5
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