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w in (-oo:+oo)
(-5/7)*w+1/3 = 29/84-((3/4)*w) // - 29/84-((3/4)*w)
(-5/7)*w+(3/4)*w+1/3-(29/84) = 0
(-5/7)*w+(3/4)*w+1/3-29/84 = 0
1/28*w-1/84 = 0 // + 1/84
1/28*w = 1/84 // : 1/28
w = 1/84/1/28
w = 1/3
w = 1/3
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