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x = 10  # Global variable

def add_to_x(y):
    global x  # Declare x as global
    x += y  # Modify the global variable

add_to_x(5)
print(x)  # Outputs: 15


def write_to_file(filename, data):
    with open(filename, 'w') as f:
        f.write(data)

write_to_file('test.txt', 'Hello, World!')