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w in (-oo:+oo)
(-7/3)*(3*w-2) = -21 // + 21
(-7/3)*(3*w-2)+21 = 0
21-7/3*(3*w-2) = 0
21-7/3*(3*w-2) = 0
77/3-7*w = 0
77/3-7*w = 0
77/3-7*w = 0 // - 77/3
-7*w = -77/3 // : -7
w = -77/3/(-7)
w = 11/3
w = 11/3
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