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