7a-21=5a+9

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Solution for 7a-21=5a+9 equation:


Simplifying
7a + -21 = 5a + 9

Reorder the terms:
-21 + 7a = 5a + 9

Reorder the terms:
-21 + 7a = 9 + 5a

Solving
-21 + 7a = 9 + 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
-21 + 7a + -5a = 9 + 5a + -5a

Combine like terms: 7a + -5a = 2a
-21 + 2a = 9 + 5a + -5a

Combine like terms: 5a + -5a = 0
-21 + 2a = 9 + 0
-21 + 2a = 9

Add '21' to each side of the equation.
-21 + 21 + 2a = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 2a = 9 + 21
2a = 9 + 21

Combine like terms: 9 + 21 = 30
2a = 30

Divide each side by '2'.
a = 15

Simplifying
a = 15

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