[HELP] ActionScript 2: Prevent doubling an action when two keys are pressed together

[realMakc]

replace

if (Key.isDown(Key.RIGHT)){
    _x += speed;
}
    
if (Key.isDown(68)){
    _x += speed;
} 

with

if (Key.isDown(Key.RIGHT) || Key.isDown(68)){
    _x += speed;
}