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artcher [175]
3 years ago
7

Sorry to bother and all but i have no idea

Mathematics
1 answer:
wlad13 [49]3 years ago
3 0

Answer:

t=40

Step-by-step explanation:

first, add 21 to -21=0

to keep it balanced add 21 to 19=40

so t=40

hope this helps

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