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Luego:
2x-x/2=900
MCM:2
4x-x=1800
3x=1800
x=1800/3
x=600
Tengo 600 soles
PLANTEAMIENTO DE LA ECUACION
2x - x/2 = 900; multiplicando toda la ec por 2 para eliminar el dnominador:
4x - x = 1800
3x = 1800
x = 1800/3
x = 600
Entonces la cantidad de soles es 600