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x in (-oo:+oo)
x/3 = 15/6 // - 15/6
x/3-(15/6) = 0
x/3-5/2 = 0
1/3*x-5/2 = 0 // + 5/2
1/3*x = 5/2 // : 1/3
x = 5/2/1/3
x = 15/2
x = 15/2
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