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25x + 5x - 10x = 120
20x = 120
x = 120 ÷ 20
x = 6
Reduces términos semejantes
25x = 120 + 5x
Agrupas las variables en un solo lado, y los números de igual manera.
25x - 5x = 120
De nuevo reduces términos semejantes
20x = 120
Despejas x
x = 120/20
Divides
x = 6