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w in (-oo:+oo)
(-5/2)*(w-1) = 9 // - 9
(-5/2)*(w-1)-9 = 0
-5/2*(w-1)-9 = 0
-5/2*(w-1)-9 = 0
-5/2*w-13/2 = 0
-5/2*w-13/2 = 0
-5/2*w-13/2 = 0 // + 13/2
-5/2*w = 13/2 // : -5/2
w = 13/2/(-5/2)
w = -13/5
w = -13/5
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