Respuesta :

Answer:

x=16

Step-by-step explanation:

4x+21=85  subtract 21 from both sides

4x=64 divide both sides by 4

x=16

pancake1127

Answer:. x=16°

4x+21=85°. ( parallel anglea are equal)

4x=85-21. (move x-es in one side and known numbers in another side)

4x=64°. (subtract)

x=64/4. (4 is multiplied to x, so when it goes to other side of =, it changes sign and divides )

x=16°

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