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a in (-oo:+oo)
a/2 = 3.5 // - 3.5
a/2-3.5 = 0
1/2*a-3.5 = 0 // + 3.5
1/2*a = 3.5 // : 1/2
a = 3.5/1/2
a = 7
a = 7
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