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x=numero que buscamos
4x-20000=x+100000
4x-x=20000+100000
3x=120000
x=120000/3
x=40000
el numero es el 40000
prueba
4x-20000=x+100000
4(40000)-20000=40000+100000
160000-20000=140000
140000=140000
saludos