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x in (-oo:+oo)
(1/2)*x-9 = -71/8 // + -71/8
(1/2)*x-(-71/8)-9 = 0
(1/2)*x+71/8-9 = 0
1/2*x-1/8 = 0 // + 1/8
1/2*x = 1/8 // : 1/2
x = 1/8/1/2
x = 1/4
x = 1/4
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