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w in (-oo:+oo)
1/8 = (w+4)/2 // - (w+4)/2
1/8-((w+4)/2) = 0
(-1*(w+4))/2+1/8 = 0
(-1*8*(w+4))/(2*8)+(1*2)/(2*8) = 0
1*2-1*8*(w+4) = 0
-8*w-30 = 0
(-8*w-30)/(2*8) = 0
(-8*w-30)/(2*8) = 0 // * 2*8
-8*w-30 = 0
-8*w-30 = 0 // + 30
-8*w = 30 // : -8
w = 30/(-8)
w = -15/4
w = -15/4
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