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a in (-oo:+oo)
a/4-(5/3) = 1/12 // - 1/12
a/4-(5/3)-(1/12) = 0
a/4-5/3-1/12 = 0
1/4*a-7/4 = 0 // + 7/4
1/4*a = 7/4 // : 1/4
a = 7/4/1/4
a = 7
a = 7
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