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x in (-oo:+oo)
x/8+x/5 = 9/8 // - 9/8
x/8+x/5-(9/8) = 0
x/8+x/5-9/8 = 0
13/40*x-9/8 = 0 // + 9/8
13/40*x = 9/8 // : 13/40
x = 9/8/13/40
x = 45/13
x = 45/13
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