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2x=15×2×3
2x=90
x=45
1/2 x + 1/ 3 x = 15 convertimos 1/2 = 3/6 y 1/3 = 2/6
3/6 x + 2/6 x = 15
5/6 x = 15
x = ( 15 ) ( 6 ) / 5
x = 18 es el número buscado