Seudónimo Seudónimo
  • 02-02-2016
  • Mathematics
contestada

Solve 2a + 21 = 8a - 9, step by step

Respuesta :

Аноним Аноним
  • 02-02-2016
2a + 21 = 8a - 9

Combine like terms. 

2a + 21 = 8a - 9
-2a          -2a

21 = 6a - 9 
+9          +9

30 = 6a
6a/6 = 30/6
a = 5

Answer: a = 5
Answer Link

Otras preguntas

Most Keyboards today are arranged in a (n) layout?
Shelly and Terrence earned points in a game by completing various tasks. Shelly completed x tasks and scored 90 points on each one. The expression below shows T
write 77/20 as a terminating decimal
which primary source document could help a historian understand why the civil war started
Which of the following non-renewable energy resources is an alternate source of energy? a. nuclear energy c. oil b. natural gas d. coal
How do plants play an important role in preventing wind erosion
what is the value of the expression |x y| |z| when x = –6, y = 4, and z = –13?
What is the structure most responsible for maintaining cell homeostasis?
rank the 4 regions of Texas from the wettest to driest
Ten times the sum of half a number and 6 is 8