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w in (-oo:+oo)
(1/3)*w-7 = -19/3 // + -19/3
(1/3)*w-(-19/3)-7 = 0
(1/3)*w+19/3-7 = 0
1/3*w-2/3 = 0 // + 2/3
1/3*w = 2/3 // : 1/3
w = 2/3/1/3
w = 2
w = 2
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