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w in (-oo:+oo)
2-((4/5)*w) = (7/15)*w+1/5 // - (7/15)*w+1/5
2-((4/5)*w)-((7/15)*w)-(1/5) = 0
(-4/5)*w+(-7/15)*w-1/5+2 = 0
9/5-19/15*w = 0 // - 9/5
-19/15*w = -9/5 // : -19/15
w = -9/5/(-19/15)
w = 27/19
w = 27/19
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