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Juntamos los términos semejantes,
100x - 110x = -40 + 10
-10x = -30.....(-1)
10x=30
Despejamos la x,
x=30/10
x= 3
Espero que te sirva, Saludos!!
100x + 40 = 110x + 10
100x - 110x = 10 - 40
-10x = -30
x = (-30)/-10
x = 3 → respuesta