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a in (-oo:+oo)
a/12 = 30/20 // - 30/20
a/12-(30/20) = 0
a/12-3/2 = 0
1/12*a-3/2 = 0 // + 3/2
1/12*a = 3/2 // : 1/12
a = 3/2/1/12
a = 18
a = 18
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