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w in (-oo:+oo)
25 = 7*w-3*w-7 // - 7*w-3*w-7
7-(-3*w)-(7*w)+25 = 0
3*w-7*w+7+25 = 0
32-4*w = 0 // - 32
-4*w = -32 // : -4
w = -32/(-4)
w = 8
w = 8
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