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y in (-oo:+oo)
y/12 = 45/30 // - 45/30
y/12-(45/30) = 0
y/12-3/2 = 0
1/12*y-3/2 = 0 // + 3/2
1/12*y = 3/2 // : 1/12
y = 3/2/1/12
y = 18
y = 18
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