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b. 15a-11a+7b-12b-5c+13ɖ= 4a-5b-5c+13ɖ
maaʆ kɭɷ ىaɭaɧ
=-3m+4n-6+7n-8m+10
=-11m+11n+4
B.( 15a+7b-5c)+(-11a-12b+13d)
=15a+7b-5c-11a-12b+13d
=4a-5b-5c+13d