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w in (-oo:+oo)
11 = (7*w-9)/2+(8*w+1)/5 // - (7*w-9)/2+(8*w+1)/5
11-((7*w-9)/2)-((8*w+1)/5) = 0
(-1*(7*w-9))/2+(-1*(8*w+1))/5+11 = 0
(-1*5*(7*w-9))/(2*5)+(-1*2*(8*w+1))/(2*5)+(2*5*11)/(2*5) = 0
2*5*11-1*5*(7*w-9)-1*2*(8*w+1) = 0
43-51*w+110 = 0
153-51*w = 0
(153-51*w)/(2*5) = 0
(153-51*w)/(2*5) = 0 // * 2*5
153-51*w = 0
153-51*w = 0 // - 153
-51*w = -153 // : -51
w = -153/(-51)
w = 3
w = 3
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