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w in (-oo:+oo)
3*w+7 = 27-7*w // - 27-7*w
3*w-(-7*w)-27+7 = 0
3*w+7*w-27+7 = 0
10*w-20 = 0 // + 20
10*w = 20 // : 10
w = 20/10
w = 2
w = 2
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