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x in (-oo:+oo)
(1/4)*x = 12/1 // - 12/1
(1/4)*x-(12/1) = 0
(1/4)*x-12 = 0
1/4*x-12 = 0 // + 12
1/4*x = 12 // : 1/4
x = 12/1/4
x = 48
x = 48
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