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w in (-oo:+oo)
-37 = 3*w-(6*w)-4 // - 3*w-(6*w)-4
6*w-(3*w)-37+4 = 0
6*w-3*w-37+4 = 0
3*w-33 = 0 // + 33
3*w = 33 // : 3
w = 33/3
w = 11
w = 11
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