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x in (-oo:+oo)
x/5 = 10/13 // - 10/13
x/5-(10/13) = 0
x/5-10/13 = 0
1/5*x-10/13 = 0 // + 10/13
1/5*x = 10/13 // : 1/5
x = 10/13/1/5
x = 50/13
x = 50/13
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