From the diagram, we can see that;
5 a - 3 = 3 a + 7
collectinf like terms,
5 a - 3 a = 7 + 3
2 a = 10
Divide both sides by 2 . we have:
a = 10/ 2
a = 5
For length AD, 5 a - 3 = 5 ( 5 ) - 3 = 25 - 3 = 22
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