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x in (-oo:+oo)
x/2 = 4.5 // - 4.5
x/2-4.5 = 0
1/2*x-4.5 = 0 // + 4.5
1/2*x = 4.5 // : 1/2
x = 4.5/1/2
x = 9
x = 9
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