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w in (-oo:+oo)
4*w-3 = -(2/7) // + 2/7
4*w+2/7-3 = 0
4*w-19/7 = 0 // + 19/7
4*w = 19/7 // : 4
w = 19/7/4
w = 19/28
w = 19/28
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