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w in (-oo:+oo)
6*w+10 = 98-2*w // - 98-2*w
6*w-(-2*w)-98+10 = 0
6*w+2*w-98+10 = 0
8*w-88 = 0 // + 88
8*w = 88 // : 8
w = 88/8
w = 11
w = 11
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