9a+15=7a+9

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Solution for 9a+15=7a+9 equation:


Simplifying
9a + 15 = 7a + 9

Reorder the terms:
15 + 9a = 7a + 9

Reorder the terms:
15 + 9a = 9 + 7a

Solving
15 + 9a = 9 + 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
15 + 9a + -7a = 9 + 7a + -7a

Combine like terms: 9a + -7a = 2a
15 + 2a = 9 + 7a + -7a

Combine like terms: 7a + -7a = 0
15 + 2a = 9 + 0
15 + 2a = 9

Add '-15' to each side of the equation.
15 + -15 + 2a = 9 + -15

Combine like terms: 15 + -15 = 0
0 + 2a = 9 + -15
2a = 9 + -15

Combine like terms: 9 + -15 = -6
2a = -6

Divide each side by '2'.
a = -3

Simplifying
a = -3

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