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b. (7n-8m+10)-(-3m+4n-6)=7n-8m+10+3m-4n+6 = 3n - 5m +16
: 15a+11a+17b-12b-5d+13d
: 26a+5b+8d
b. -3m+4n-6 - (7n-8m+10) : -3m+4n-6 -7n+8m-10
: -3m+8m+4n-7n-6-10
: 5m-3n-16