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y in (-oo:+oo)
(y+7)/2 = (y+5)/1.6 // - (y+5)/1.6
(y+7)/2-((y+5)/1.6) = 0
(y+7)/2-0.625*(y+5) = 0
(y+7)/2+(-0.625*2*(y+5))/2 = 0
y-0.625*2*(y+5)+7 = 0
0.75-0.25*y = 0
(0.75-0.25*y)/2 = 0
(0.75-0.25*y)/2 = 0 // * 2
0.75-0.25*y = 0
0.75-0.25*y = 0 // - 0.75
-0.25*y = -0.75 // : -0.25
y = -0.75/(-0.25)
y = 3
y = 3
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