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b.4a-5b-5c+13d
a.5m-3n-16
b.26a+19b-18d
Cara
a.-3m+-8m=-11m
4n+7n=11n
-6+10=4
b.15a+-11a=4a
7b+-12b=-5b
yang -5c sama 13d sama karena tidak ada pasangannya
a.-3m-(-8m)=-3m+8m=5m
4n-7n=-3n
-6+10=4
b.15a-(-11a)=15a + 11a=26a
7b-(-12b)=7b+12b=19b
sama kaya atas yang a