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y in (-oo:+oo)
(1/2)*(y-6) = 12 // - 12
(1/2)*(y-6)-12 = 0
1/2*(y-6)-12 = 0
1/2*(y-6)-12 = 0
1/2*y-15 = 0
1/2*y-15 = 0
1/2*y-15 = 0 // + 15
1/2*y = 15 // : 1/2
y = 15/1/2
y = 30
y = 30
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