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OCR: Canceling mgc and substituting Gms = (주) from (1): 73 (m) +(79) = (r + a) ( =) and dividing by G . mg: me 1 + 1 r+a _1+ (a/r) mg 82 = (r + a)2 3 = 12 Now let u = me and z =- . Notice that z is very small, since a is much less than r. After these substitutions, 1 1+2 (r+ a)2 12 (See next card for continuation.)