7 square root of 3 plus 2 square root of 9

6+7√3  or  18.12

Step-by-step explanation:

7√3+2√9= 7√3+2*3= 6+7√3

6+7√3= 18.12

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0