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w in (-oo:+oo)
(1/3)*(6*w-3) = 3*w+12 // - 3*w+12
(1/3)*(6*w-3)-(3*w)-12 = 0
(1/3)*(6*w-3)-3*w-12 = 0
1/3*(6*w-3)-3*w-12 = 0
1/3*(6*w-3)-3*w-12 = 0
-w-12-1 = 0
-w-13 = 0
-w-13 = 0
-w-13 = 0 // + 13
-w = 13 // * -1
w = -13
w = -13
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