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n in (-oo:+oo)
56 = (n-40)/4+50 // - (n-40)/4+50
56-((n-40)/4)-50 = 0
(-1*(n-40))/4-50+56 = 0
(-1*(n-40))/4+(-50*4)/4+(4*56)/4 = 0
4*56-1*(n-40)-50*4 = 0
224-n-160 = 0
64-n = 0
(64-n)/4 = 0
(64-n)/4 = 0 // * 4
64-n = 0
64-n = 0 // - 64
-n = -64 // * -1
n = 64
n = 64
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