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quitestudious
Since it’s indicated that BC and AD are congruent, you can set the two sides/equations equal to one another:

3x+3=x+21

Then, you can solve for x:

3x+3=x+21
2x=18
x=9

Plugging in 9 into either equation of BC or AD should give you 30 for both sides:

3(9)+3=30
(9)+21=30

For CD, you can also plug in 9 for x:

2(9)-9=18

Since AB and CD are labeled as congruent, both sides are 18.

x=9
AB=18
BC=30
CD=18
AD=30

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