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w in (-oo:+oo)
4*w-7 = -35/9 // + -35/9
4*w-(-35/9)-7 = 0
4*w+35/9-7 = 0
4*w-28/9 = 0 // + 28/9
4*w = 28/9 // : 4
w = 28/9/4
w = 7/9
w = 7/9
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