Answer :

clarch19

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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