Help!! I need the answer with an explanation or else I’ll loose marks

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

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What is the value of x in the equation 1.5x+4-3=4.5(x-2)?