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x in (-oo:+oo)
x/3-(x/5) = 3 // - 3
x/3-(x/5)-3 = 0
2/15*x-3 = 0 // + 3
2/15*x = 3 // : 2/15
x = 3/2/15
x = 45/2
x = 45/2
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