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w in (-oo:+oo)
(2/3)*w-(7/5) = -5/4 // + -5/4
(2/3)*w-(7/5)-(-5/4) = 0
(2/3)*w-7/5+5/4 = 0
2/3*w-3/20 = 0 // + 3/20
2/3*w = 3/20 // : 2/3
w = 3/20/2/3
w = 9/40
w = 9/40
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