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w in (-oo:+oo)
(-2/3)*w-(3/2) = -5/7 // + -5/7
(-2/3)*w-(3/2)-(-5/7) = 0
(-2/3)*w-3/2+5/7 = 0
-2/3*w-11/14 = 0 // + 11/14
-2/3*w = 11/14 // : -2/3
w = 11/14/(-2/3)
w = -33/28
w = -33/28
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