15=1+7a

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Solution for 15=1+7a equation:


Simplifying
15 = 1 + 7a

Solving
15 = 1 + 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 + -7a = 1 + 7a + -7a

Combine like terms: 7a + -7a = 0
15 + -7a = 1 + 0
15 + -7a = 1

Add '-15' to each side of the equation.
15 + -15 + -7a = 1 + -15

Combine like terms: 15 + -15 = 0
0 + -7a = 1 + -15
-7a = 1 + -15

Combine like terms: 1 + -15 = -14
-7a = -14

Divide each side by '-7'.
a = 2

Simplifying
a = 2

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