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X in (-oo:+oo)
15 = (237.5-X)/2.5 // - (237.5-X)/2.5
15-((237.5-X)/2.5) = 0
15-0.4*(237.5-X) = 0
15-0.4*(237.5-X) = 0
0.4*X-80 = 0
0.4*X-80 = 0
0.4*X-80 = 0 // + 80
0.4*X = 80 // : 0.4
X = 80/0.4
X = 200
X = 200
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