Unless you're 'assisted', it's virtually impossible to gain mass while losing fat. They're polar opposites. To lose fat/weight you need to be in a caloric deficit, to gain muscle/weight you need to be in a caloric excess.
Therefore, losing fat without losing weight is also virtually impossible (if you're natural).
I would not focus on cardio, lifting heavy while cutting helps to spare your muscle mass (you're body won't keep what it doesn't use/need).
By all means, throw some cardio work in for it's general health benefits, but cutting/ fat loss is controlled by your diet.
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