1) 3a+12+4a-12 = 7a
2) 2b+14-3b-3 = 11-b
3) 8c-24+5c+20 = 13c-4
4) 2.4d+2.4-2.4d+1.8 = 4.2
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Answers & Comments
1) 3a+12+4a-12 = 7a
2) 2b+14-3b-3 = 11-b
3) 8c-24+5c+20 = 13c-4
4) 2.4d+2.4-2.4d+1.8 = 4.2