Book Maths Puzzle

SIMPLYPHY
112+667-554/432*44455-7778+444225*44433333/5566455=?

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Book Other Question

If x% of 24=64,the value of x is ? I just have a doubt please reply my question is while finding envelope of a curve why should we differentiate the equation partially with respect to the parameter and equate it to 0 if anybody knows please clear my doubt