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w in (-oo:+oo)
7-(3*w)-(3*w) = 19 // - 19
7-(3*w)-(3*w)-19 = 0
7-3*w-3*w-19 = 0
-6*w-12 = 0 // + 12
-6*w = 12 // : -6
w = 12/(-6)
w = -2
w = -2
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