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w in (-oo:+oo)
(-1/3)*w+(2/3)*w = 5/7-(2/7) // - 5/7-(2/7)
(-1/3)*w+(2/3)*w-(5/7)+2/7 = 0
(-1/3)*w+(2/3)*w-5/7+2/7 = 0
1/3*w-3/7 = 0 // + 3/7
1/3*w = 3/7 // : 1/3
w = 3/7/1/3
w = 9/7
w = 9/7
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