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x in (-oo:+oo)
(1/2)*x = 21.8 // - 21.8
(1/2)*x-21.8 = 0
1/2*x-21.8 = 0 // + 21.8
1/2*x = 21.8 // : 1/2
x = 21.8/1/2
x = 43.6
x = 43.6
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