Answer :

The answer is 3x+60


Explaining: 53+(3x+7)
53+3x+7
53+7=60
60+3x

Step-by-step explanation:

(53+3x+7)(53+3x+7)

(60+3x)(60+3x)

3600+180x+180x+9x^2

3600+360x+9x^2

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