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7x=21
x=21/7
x=3
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2(3)+5(3)=21
entonces seria 2x + 5x = 7x
7x es igual 21
x es el numero de veces que debo multiplicar a 7 para que me de 21
x = 21 / 7 --- > x = 3
debo multiplicar 3 veces 7 para obtener 21