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x in (-oo:+oo)
(1/4)*x+5/4 = 9 // - 9
(1/4)*x+5/4-9 = 0
1/4*x-31/4 = 0 // + 31/4
1/4*x = 31/4 // : 1/4
x = 31/4/1/4
x = 31
x = 31
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