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w in (-oo:+oo)
5*w-((5/7)*w)-2 = -13/14 // + -13/14
5*w-((5/7)*w)-(-13/14)-2 = 0
5*w+(-5/7)*w+13/14-2 = 0
30/7*w-15/14 = 0 // + 15/14
30/7*w = 15/14 // : 30/7
w = 15/14/30/7
w = 1/4
w = 1/4
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