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x in (-oo:+oo)
(1/4)*x = 9/2 // - 9/2
(1/4)*x-(9/2) = 0
(1/4)*x-9/2 = 0
1/4*x-9/2 = 0 // + 9/2
1/4*x = 9/2 // : 1/4
x = 9/2/1/4
x = 18
x = 18
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