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w in (-oo:+oo)
(7/12)*w = 135/12 // - 135/12
(7/12)*w-(135/12) = 0
(7/12)*w-45/4 = 0
7/12*w-45/4 = 0 // + 45/4
7/12*w = 45/4 // : 7/12
w = 45/4/7/12
w = 135/7
w = 135/7
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