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w in (-oo:+oo)
5-3*w-(7*w) = 55 // - 55
5-3*w-(7*w)-55 = 0
5-3*w-7*w-55 = 0
-10*w-50 = 0 // + 50
-10*w = 50 // : -10
w = 50/(-10)
w = -5
w = -5
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