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w in (-oo:+oo)
7.2 = w/8+5.1 // - w/8+5.1
7.2-(w/8)-5.1 = 0
2.1-1/8*w = 0 // - 2.1
-1/8*w = -2.1 // : -1/8
w = -2.1/(-1/8)
w = 16.8
w = 16.8
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