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y in (-oo:+oo)
(1/2)*(y-6) = 7 // - 7
(1/2)*(y-6)-7 = 0
1/2*(y-6)-7 = 0
1/2*(y-6)-7 = 0
1/2*y-10 = 0
1/2*y-10 = 0
1/2*y-10 = 0 // + 10
1/2*y = 10 // : 1/2
y = 10/1/2
y = 20
y = 20
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