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w in (-oo:+oo)
7*w+2 = 2*w+22 // - 2*w+22
7*w-(2*w)-22+2 = 0
7*w-2*w-22+2 = 0
5*w-20 = 0 // + 20
5*w = 20 // : 5
w = 20/5
w = 4
w = 4
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