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w in (-oo:+oo)
2*(5-7*w) = 122 // - 122
2*(5-7*w)-122 = 0
2*(5-7*w)-122 = 0
-14*w-112 = 0
-14*w-112 = 0
-14*w-112 = 0 // + 112
-14*w = 112 // : -14
w = 112/(-14)
w = -8
w = -8
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