5a+4a+9=21a-39

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Solution for 5a+4a+9=21a-39 equation:


Simplifying
5a + 4a + 9 = 21a + -39

Reorder the terms:
9 + 5a + 4a = 21a + -39

Combine like terms: 5a + 4a = 9a
9 + 9a = 21a + -39

Reorder the terms:
9 + 9a = -39 + 21a

Solving
9 + 9a = -39 + 21a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-21a' to each side of the equation.
9 + 9a + -21a = -39 + 21a + -21a

Combine like terms: 9a + -21a = -12a
9 + -12a = -39 + 21a + -21a

Combine like terms: 21a + -21a = 0
9 + -12a = -39 + 0
9 + -12a = -39

Add '-9' to each side of the equation.
9 + -9 + -12a = -39 + -9

Combine like terms: 9 + -9 = 0
0 + -12a = -39 + -9
-12a = -39 + -9

Combine like terms: -39 + -9 = -48
-12a = -48

Divide each side by '-12'.
a = 4

Simplifying
a = 4

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