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w in (-oo:+oo)
(7/3)*(3*w-2) = -21 // + 21
(7/3)*(3*w-2)+21 = 0
7/3*(3*w-2)+21 = 0
7/3*(3*w-2)+21 = 0
7*w+49/3 = 0
7*w+49/3 = 0
7*w+49/3 = 0 // - 49/3
7*w = -49/3 // : 7
w = -49/3/7
w = -7/3
w = -7/3
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