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w in (-oo:+oo)
(-4/7)*w+10 = 205/21 // - 205/21
(-4/7)*w-(205/21)+10 = 0
(-4/7)*w-205/21+10 = 0
5/21-4/7*w = 0 // - 5/21
-4/7*w = -5/21 // : -4/7
w = -5/21/(-4/7)
w = 5/12
w = 5/12
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