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=19x - 6x +2y + 5y - 2
=13x + 7y - 2
2. 20a - 11b - 6c + 3a - 4b - 6c +10
=20a + 3a - 11b - 4b - 6c - 6 c + 10
=23a - 15b - 12c + 10
3. 5p - 6m + 4p - 7m + 5
= 5p + 4p - 6m - 7m + 5
= 9p - 13m + 5
=13x+7y-2
2.20a+3a-11b-4b-6c-6c+10
=23a-15b-12c+10
3.5p+4p-6m-7m+5
=9p-13m+5