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x in (-oo:+oo)
x/4 = 3/6 // - 3/6
x/4-(3/6) = 0
x/4-1/2 = 0
1/4*x-1/2 = 0 // + 1/2
1/4*x = 1/2 // : 1/4
x = 1/2/1/4
x = 2
x = 2
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