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w in (-oo:+oo)
(8*w-7)/4-((3*w)/2)-1+9 = w-((5*(2*w-3))/2) // - w-((5*(2*w-3))/2)
(8*w-7)/4+(5*(2*w-3))/2-((3*w)/2)-w-1+9 = 0
(8*w-7)/4+(5*(2*w-3))/2+(-3/2)*w-w-1+9 = 0
(8*w-7)/4+(5*(2*w-3))/2+(-3*w)/2-w-1+9 = 0
(2*(8*w-7))/(2*4)+(4*5*(2*w-3))/(2*4)+(-3*4*w)/(2*4)+(2*4*(-w))/(2*4)+(-1*2*4)/(2*4)+(2*4*9)/(2*4) = 0
2*(8*w-7)+4*5*(2*w-3)-3*4*w+2*4*(-w)-1*2*4+2*4*9 = 0
56*w-12*w-8*w-74-8+72 = 0
44*w-8*w-74-8+72 = 0
36*w-74-8+72 = 0
36*w-82+72 = 0
36*w-10 = 0
(36*w-10)/(2*4) = 0
(36*w-10)/(2*4) = 0 // * 2*4
36*w-10 = 0
36*w-10 = 0 // + 10
36*w = 10 // : 36
w = 10/36
w = 5/18
w = 5/18
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