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w in (-oo:+oo)
(1/2)*(w+6) = 12 // - 12
(1/2)*(w+6)-12 = 0
1/2*(w+6)-12 = 0
1/2*(w+6)-12 = 0
1/2*w-9 = 0
1/2*w-9 = 0
1/2*w-9 = 0 // + 9
1/2*w = 9 // : 1/2
w = 9/1/2
w = 18
w = 18
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