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2(x+3)=14 haces propiedad distributiva te queda así
2x+6=14
2x=14-6
x=8:2
x=4
2 (x + 3) = 14
2x + 6 = 14
2x = 14 - 6
2x = 8
x = 8/2
x = 4 → Respuesta
COMPROBAMOS EL RESULTADO:
2 (x + 3) = 14
2 (4 + 3) = 14
2 (7) = 14
14 = 14 → Se cumple la igualdad