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w in (-oo:+oo)
-(7*w)-2/5 = 103/5 // - 103/5
-(7*w)-2/5-(103/5) = 0
-7*w-2/5-103/5 = 0
-7*w-21 = 0 // + 21
-7*w = 21 // : -7
w = 21/(-7)
w = -3
w = -3
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