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x=900/4
x=225
225+3(225)=900
4x = 900
x = 900/4
x = 225
Solución :
x = 225
COMPROBAMOS :
x + 3x = 900
225 + 3 (225) = 900
225 + 675 = 900
900 = 900
La solución es correcta.