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w in (-oo:+oo)
7.1 = w/7 // - w/7
7.1-(w/7) = 0
7.1-1/7*w = 0 // - 7.1
-1/7*w = -7.1 // : -1/7
w = -7.1/(-1/7)
w = 49.70000099
w = 49.70000099
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