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w in (-oo:+oo)
7*(5*w-1) = -77 // + 77
7*(5*w-1)+77 = 0
7*(5*w-1)+77 = 0
35*w+70 = 0
35*w+70 = 0
35*w+70 = 0 // - 70
35*w = -70 // : 35
w = -70/35
w = -2
w = -2
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