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w in (-oo:+oo)
-59/7 = 2*w+w+4/7 // - 2*w+w+4/7
-(2*w)-w-59/7-(4/7) = 0
-2*w-w-59/7-4/7 = 0
-3*w-9 = 0 // + 9
-3*w = 9 // : -3
w = 9/(-3)
w = -3
w = -3
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