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w in (-oo:+oo)
(-7/3)*w = 20 // - 20
(-7/3)*w-20 = 0
-7/3*w-20 = 0 // + 20
-7/3*w = 20 // : -7/3
w = 20/(-7/3)
w = -60/7
w = -60/7
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