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y in (-oo:+oo)
(y+5)/12 = 3/4-((y+1)/8) // - 3/4-((y+1)/8)
(y+5)/12+(y+1)/8-(3/4) = 0
(y+5)/12+(y+1)/8-3/4 = 0
(4*8*(y+5))/(4*8*12)+(4*12*(y+1))/(4*8*12)+(-3*8*12)/(4*8*12) = 0
4*8*(y+5)+4*12*(y+1)-3*8*12 = 0
80*y-288+208 = 0
80*y-80 = 0
(80*y-80)/(4*8*12) = 0
(80*y-80)/(4*8*12) = 0 // * 4*8*12
80*y-80 = 0
80*y-80 = 0 // + 80
80*y = 80 // : 80
y = 80/80
y = 1
y = 1
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