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