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w in (-oo:+oo)
w-(3*w)-7 = -41/7 // + -41/7
w-(3*w)-(-41/7)-7 = 0
w-3*w+41/7-7 = 0
-2*w-8/7 = 0 // + 8/7
-2*w = 8/7 // : -2
w = 8/7/(-2)
w = -4/7
w = -4/7
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