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12x-4x=25-21
8x=4
x=4/8
x=1/2
Asi que x vale 1/2.
Para comprobar solo reemplaza x por 1/2 y saldra la igualdad,asi:
3(4(1/2)+7)=4(1/2)+25
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Espero que te sirva, salu2!!!!