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y in (-oo:+oo)
(1/4)*(y-8) = 20 // - 20
(1/4)*(y-8)-20 = 0
1/4*(y-8)-20 = 0
1/4*(y-8)-20 = 0
1/4*y-22 = 0
1/4*y-22 = 0
1/4*y-22 = 0 // + 22
1/4*y = 22 // : 1/4
y = 22/1/4
y = 88
y = 88
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