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c in (-oo:+oo)
51 = 50-((c-40)/4) // - 50-((c-40)/4)
(c-40)/4-50+51 = 0
(c-40)/4+(-50*4)/4+(4*51)/4 = 0
c-50*4+4*51-40 = 0
c-240+204 = 0
c-36 = 0
(c-36)/4 = 0
(c-36)/4 = 0 // * 4
c-36 = 0
c-36 = 0 // + 36
c = 36
c = 36
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