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y in (-oo:+oo)
(4*y-36)/2 = 12 // - 12
(4*y-36)/2-12 = 0
(4*y-36)/2+(-12*2)/2 = 0
4*y-12*2-36 = 0
4*y-60 = 0
(4*y-60)/2 = 0
(4*y-60)/2 = 0 // * 2
4*y-60 = 0
4*y-60 = 0 // + 60
4*y = 60 // : 4
y = 60/4
y = 15
y = 15
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