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w in (-oo:+oo)
(1/4)*w-1 = -33/40 // + -33/40
(1/4)*w-(-33/40)-1 = 0
(1/4)*w+33/40-1 = 0
1/4*w-7/40 = 0 // + 7/40
1/4*w = 7/40 // : 1/4
w = 7/40/1/4
w = 7/10
w = 7/10
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