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x in (-oo:+oo)
x/4 = 13/4 // - 13/4
x/4-(13/4) = 0
x/4-13/4 = 0
1/4*x-13/4 = 0 // + 13/4
1/4*x = 13/4 // : 1/4
x = 13/4/1/4
x = 13
x = 13
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