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y in (-oo:+oo)
(1/2)*(y-18) = -2 // + 2
(1/2)*(y-18)+2 = 0
1/2*(y-18)+2 = 0
1/2*(y-18)+2 = 0
1/2*y-7 = 0
1/2*y-7 = 0
1/2*y-7 = 0 // + 7
1/2*y = 7 // : 1/2
y = 7/1/2
y = 14
y = 14
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