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w in (-oo:+oo)
4-3*w = 7*w+64 // - 7*w+64
4-3*w-(7*w)-64 = 0
4-3*w-7*w-64 = 0
-10*w-60 = 0 // + 60
-10*w = 60 // : -10
w = 60/(-10)
w = -6
w = -6
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