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x in (-oo:+oo)
(1/2)*x = 2.5 // - 2.5
(1/2)*x-2.5 = 0
1/2*x-2.5 = 0 // + 2.5
1/2*x = 2.5 // : 1/2
x = 2.5/1/2
x = 5
x = 5
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