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x in (-oo:+oo)
0.28 = (25-x)/25 // - (25-x)/25
0.28-((25-x)/25) = 0
(-1*(25-x))/25+0.28 = 0
(-1*(25-x))/25+(0.28*25)/25 = 0
0.28*25-1*(25-x) = 0
x-18 = 0
(x-18)/25 = 0
(x-18)/25 = 0 // * 25
x-18 = 0
x-18 = 0 // + 18
x = 18
x = 18
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