15=a+8

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Solution for 15=a+8 equation: 


Simplifying
15 = a + 8

Reorder the terms:
15 = 8 + a

Solving
15 = 8 + a

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 = 8 + a + -1a

Combine like terms: a + -1a = 0
15 + -1a = 8 + 0
15 + -1a = 8

Add '-15' to each side of the equation.
15 + -15 + -1a = 8 + -15

Combine like terms: 15 + -15 = 0
0 + -1a = 8 + -15
-1a = 8 + -15

Combine like terms: 8 + -15 = -7
-1a = -7

Divide each side by '-1'.
a = 7

Simplifying
a = 7

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