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En los dos casos
1º - reducir términos semejantes
2º - despejar incógnita
3º - dar resultado
A)
x + 81 + 23 = 204
x = 204 - 81 - 23
x = 100
B)
5 . x + 19 = 64
5x = 64 - 19
5x = 45
x = 45/5
x = 9