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Planteamiento:
6x+14=2(x+21)
Proceso:
6x+14=2x+42
6x-2x=-14+42
4x=28
x=28/4
x=7
Comprobación:
6(7)+14=2(7+21)
42+14=14+42
56=56
Espero haberte ayudado. Saludos