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x in (-oo:+oo)
(1/2)*x-9 = -2.14 // + 2.14
(1/2)*x-9+2.14 = 0
1/2*x-6.86 = 0 // + 6.86
1/2*x = 6.86 // : 1/2
x = 6.86/1/2
x = 13.72
x = 13.72
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