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(7n-8m+10) - (-3+4n-6)
7n-8m+10+3-4n+6
7n-4n-8m+10+3+6
3n-8m+19
(15a+7b-5c) - (-11a-12b+13d)
(-11a-12b+13c) - (15a+7b-5c)
-11a-12b+13c-15a-7b+5c
-11a-15a-12b-7b+13c+5c
-26a-19b+18c