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x in (-oo:+oo)
13*x = 3/4 // - 3/4
13*x-(3/4) = 0
13*x-3/4 = 0
13*x-3/4 = 0 // + 3/4
13*x = 3/4 // : 13
x = 3/4/13
x = 3/52
x = 3/52
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