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w in (-oo:+oo)
7*w-(2*w)-8 = -13 // + 13
7*w-(2*w)-8+13 = 0
7*w-2*w-8+13 = 0
5*w+5 = 0 // - 5
5*w = -5 // : 5
w = -5/5
w = -1
w = -1
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