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a in (-oo:+oo)
a/4 = 9/2 // - 9/2
a/4-(9/2) = 0
a/4-9/2 = 0
1/4*a-9/2 = 0 // + 9/2
1/4*a = 9/2 // : 1/4
a = 9/2/1/4
a = 18
a = 18
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