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y in (-oo:+oo)
(1/4)*(y-20) = 12 // - 12
(1/4)*(y-20)-12 = 0
1/4*(y-20)-12 = 0
1/4*(y-20)-12 = 0
1/4*y-17 = 0
1/4*y-17 = 0
1/4*y-17 = 0 // + 17
1/4*y = 17 // : 1/4
y = 17/1/4
y = 68
y = 68
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