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w in (-oo:+oo)
10-7*w-(7*w) = -32 // + 32
10-7*w-(7*w)+32 = 0
10-7*w-7*w+32 = 0
42-14*w = 0 // - 42
-14*w = -42 // : -14
w = -42/(-14)
w = 3
w = 3
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