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w in (-oo:+oo)
w-((5/4)*w)+2/7 = (5/4)*(w+1/7) // - (5/4)*(w+1/7)
w-((5/4)*(w+1/7))-((5/4)*w)+2/7 = 0
(-5/4)*(w+1/7)+w+(-5/4)*w+2/7 = 0
w-5/4*(w+1/7)+(-5*w)/4+2/7 = 0
(-5/4*4*7*(w+1/7))/(4*7)+(4*7*w)/(4*7)+(-5*7*w)/(4*7)+(2*4)/(4*7) = 0
4*7*w-5/4*4*7*(w+1/7)-5*7*w+2*4 = 0
8-7*w-35*w-5 = 0
8-42*w-5 = 0
3-42*w = 0
(3-42*w)/(4*7) = 0
(3-42*w)/(4*7) = 0 // * 4*7
3-42*w = 0
3-42*w = 0 // - 3
-42*w = -3 // : -42
w = -3/(-42)
w = 1/14
w = 1/14
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