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BlackZzzverrR [31]
2 years ago
5

No, one, or infinitely many solutions

Mathematics
1 answer:
Aleks04 [339]2 years ago
4 0

Answer:

one, no, one, infinitely

Step-by-step explanation:

a. you can get 7x = 21 - 21 = 0 ==> x = 0

b. subtract 12x from both sides ==> get 15 = -15, which is not true

c. -5x-5x=25+25 ==> -10x = 50 ==> x = -5

d. get -2x -6 -7 = -2x - 6 - 7 ==> so it's infinitely

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