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w in (-oo:+oo)
-w-7 = -((2/3)*w)-67/10 // + -((2/3)*w)-67/10
(2/3)*w-w-(-67/10)-7 = 0
(2/3)*w-w+67/10-7 = 0
-1/3*w-3/10 = 0 // + 3/10
-1/3*w = 3/10 // : -1/3
w = 3/10/(-1/3)
w = -9/10
w = -9/10
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