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y in (-oo:+oo)
4*y-(36/2) = 12 // - 12
4*y-(36/2)-12 = 0
4*y-18-12 = 0
4*y-30 = 0 // + 30
4*y = 30 // : 4
y = 30/4
y = 15/2
y = 15/2
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