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x in (-oo:+oo)
9*x-(1/2) = 31 // - 31
9*x-(1/2)-31 = 0
9*x-1/2-31 = 0
9*x-63/2 = 0 // + 63/2
9*x = 63/2 // : 9
x = 63/2/9
x = 7/2
x = 7/2
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