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w in (-oo:+oo)
w-((7/2)*w)-(1/7) = (-5/3)*(w-(1/5)) // - (-5/3)*(w-(1/5))
w-((-5/3)*(w-(1/5)))-((7/2)*w)-(1/7) = 0
(5/3)*(w-1/5)+w+(-7/2)*w-1/7 = 0
5/3*(w-1/5)+w+(-7*w)/2-1/7 = 0
(5/3*2*7*(w-1/5))/(2*7)+(2*7*w)/(2*7)+(-7*7*w)/(2*7)+(-1*2)/(2*7) = 0
5/3*2*7*(w-1/5)+2*7*w-7*7*w-1*2 = 0
112/3*w-49*w-14/3-2 = 0
-35/3*w-14/3-2 = 0
-35/3*w-20/3 = 0
(-35/3*w-20/3)/(2*7) = 0
(-35/3*w-20/3)/(2*7) = 0 // * 2*7
-35/3*w-20/3 = 0
-35/3*w-20/3 = 0 // + 20/3
-35/3*w = 20/3 // : -35/3
w = 20/3/(-35/3)
w = -4/7
w = -4/7
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