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Sagot :
Answer:
18
Step-by-step explanation:
to get from 7 to 21 you must multiply by 3
you have to do the same then to the denominator
6x3 = 18
To check:
see if 7/6 = 21/18
by seeing it their cross-products are equal
does 7(18) = 6(21)?
126=126
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