1. 15a + (-11a) + 7b+ (-12b) - 5c + 13 d
4a - 5b - 5c + 13d
2. 7a - 8a + 4b - (-6b)
-1a + 10b
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-11a-12b +13d
___________________+
4a-5b-5c+13d
b.7a + 4b
8a - 6b
__________-
-a + 10 b
1. 15a + (-11a) + 7b+ (-12b) - 5c + 13 d
4a - 5b - 5c + 13d
2. 7a - 8a + 4b - (-6b)
-1a + 10b