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w in (-oo:+oo)
7*(5-w) = 98 // - 98
7*(5-w)-98 = 0
7*(5-w)-98 = 0
-7*w-63 = 0
-7*w-63 = 0
-7*w-63 = 0 // + 63
-7*w = 63 // : -7
w = 63/(-7)
w = -9
w = -9
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