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w in (-oo:+oo)
(-2/3)*w+10 = 7*w+56 // - 7*w+56
(-2/3)*w-(7*w)-56+10 = 0
(-2/3)*w-7*w-56+10 = 0
-23/3*w-46 = 0 // + 46
-23/3*w = 46 // : -23/3
w = 46/(-23/3)
w = -6
w = -6
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