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w in (-oo:+oo)
10-3*w-(4*w) = 15 // - 15
10-3*w-(4*w)-15 = 0
10-3*w-4*w-15 = 0
-7*w-5 = 0 // + 5
-7*w = 5 // : -7
w = 5/(-7)
w = -5/7
w = -5/7
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