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y in (-oo:+oo)
(1/2)*(y-4) = 18 // - 18
(1/2)*(y-4)-18 = 0
1/2*(y-4)-18 = 0
1/2*(y-4)-18 = 0
1/2*y-20 = 0
1/2*y-20 = 0
1/2*y-20 = 0 // + 20
1/2*y = 20 // : 1/2
y = 20/1/2
y = 40
y = 40
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