15=1a+9

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Solution for 15=1a+9 equation:


Simplifying
15 = 1a + 9

Reorder the terms:
15 = 9 + 1a

Solving
15 = 9 + 1a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
15 + -1a = 9 + 1a + -1a

Combine like terms: 1a + -1a = 0
15 + -1a = 9 + 0
15 + -1a = 9

Add '-15' to each side of the equation.
15 + -15 + -1a = 9 + -15

Combine like terms: 15 + -15 = 0
0 + -1a = 9 + -15
-1a = 9 + -15

Combine like terms: 9 + -15 = -6
-1a = -6

Divide each side by '-1'.
a = 6

Simplifying
a = 6

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