Harita must memorize 90 measures of music for her cello solo at a concert. She plans on memorizing 18 new measures for every 3 days of practice. Which equation can be used to determine m, the number of measures Harita still needs to memorize, as a function of d, the number of days of practice since she began learning the piece?
a. m = 72 - 15d
b. m = 90 - 6d
c. m = 101 - 21d
d. m = 108 - 3d
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