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w in (-oo:+oo)
7*(5*w+9) = 483 // - 483
7*(5*w+9)-483 = 0
7*(5*w+9)-483 = 0
35*w-420 = 0
35*w-420 = 0
35*w-420 = 0 // + 420
35*w = 420 // : 35
w = 420/35
w = 12
w = 12
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