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Sagot :
Answer:
1) 16x-2
2) 15x-2
3) 7
Step-by-step explanation:
1) (9x+4)+(7x−6)
9x+4+7x-6
9x+7x+4-6
16x+4-6
16x-2
2) (12x+5)+(3x−7)
12x+5+3x-7
12x+3x+5-7
15x+5-7
15x-2
3) 7y+15-7y-8
7y-7y+15-8
15-8
7
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