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28= 7x
x=28/7 esto va en fraccion
x=4
comprobacion
2(4)+5(4)=28
8+20=28
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2x + 5x = 28
7x = 28
x = 28 ÷ 7
x = 4 ==> Respuesta
COMPROBAMOS:
================
2x + 5x = 28
2(4) + 5(4) = 28
8 + 20 = 28
28 = 28 ==> CORRECTO
RESPUESTA:
==============
x = 4
Espero que te ayude.
Saludos!!