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x in (-oo:+oo)
x/4 = 13/2 // - 13/2
x/4-(13/2) = 0
x/4-13/2 = 0
1/4*x-13/2 = 0 // + 13/2
1/4*x = 13/2 // : 1/4
x = 13/2/1/4
x = 26
x = 26
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