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w in (-oo:+oo)
(-1/3)*w+3/4 = 13/28 // - 13/28
(-1/3)*w+3/4-(13/28) = 0
(-1/3)*w+3/4-13/28 = 0
2/7-1/3*w = 0 // - 2/7
-1/3*w = -2/7 // : -1/3
w = -2/7/(-1/3)
w = 6/7
w = 6/7
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