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2.5a+2b-3a+3b = 5a-3a+2b+3b = 2a+5b
3.-64+7b-2b+10a+8 = -64+8+7B-2B+10A= -56+5B+10A
4.3A+2B+4C - 4A+5B+8C = 4A+5B+8C -3A+2B+4C = 4A-3A+5B+2B+8C+4C = 1A+7B+12C
5. 6A+8C+9D+ -8A + 10C -12D = 6A+-8A+8C+10C+9D-12D = -2A+18C-3D