Simplify. Write your answer as an improper fraction.
4+(47+(26+(12)))\displaystyle {4}+{\left(\frac{{4}}{{{7}+{\left(\frac{{2}}{{{6}+{\left(\frac{{1}}{{2}}\right)}}}\right)}}}\right)}4+⎝⎛7+(6+(21)2)4⎠⎞
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