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4x = 28 - 12
4x = 16
x = 16/4
x = 4--------Respuesta
=================
4x + 12 = 28
4x = 28 - 12
4x = 16
x = 16 ÷ 4
x = 4 → Respuesta
COMPROBAMOS:
4x + 12 = 28
4(4) + 12 = 28
16 + 12 = 28
28 = 28 → Correcto
► RESPUESTA:
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x = 4
Espero que te ayude.
Saludos!!