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y in (-oo:+oo)
1 = (y-76)/4 // - (y-76)/4
1-((y-76)/4) = 0
(-1*(y-76))/4+1 = 0
(-1*(y-76))/4+(1*4)/4 = 0
1*4-1*(y-76) = 0
80-y = 0
(80-y)/4 = 0
(80-y)/4 = 0 // * 4
80-y = 0
80-y = 0 // - 80
-y = -80 // * -1
y = 80
y = 80
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