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x in (-oo:+oo)
(x+7)/16 = (x+1)/8 // - (x+1)/8
(x+7)/16-((x+1)/8) = 0
(x+7)/16+(-1*(x+1))/8 = 0
(8*(x+7))/(8*16)+(-1*16*(x+1))/(8*16) = 0
8*(x+7)-1*16*(x+1) = 0
40-8*x = 0
(40-8*x)/(8*16) = 0
(40-8*x)/(8*16) = 0 // * 8*16
40-8*x = 0
40-8*x = 0 // - 40
-8*x = -40 // : -8
x = -40/(-8)
x = 5
x = 5
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