X + 100 = 300
300 - 100 = 200
X = 200
comprobación: 200 + 100 = 300
si restamos 300 - 100 podremos hallar X
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X + 100 = 300
300 - 100 = 200
X = 200
comprobación: 200 + 100 = 300
si restamos 300 - 100 podremos hallar X