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x in (-oo:+oo)
x/4 = 9/3 // - 9/3
x/4-(9/3) = 0
x/4-3 = 0
1/4*x-3 = 0 // + 3
1/4*x = 3 // : 1/4
x = 3/1/4
x = 12
x = 12
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