a+7d=-13

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Solution for a+7d=-13 equation: 


Simplifying
a + 7d = -13

Solving
a + 7d = -13

Solving for variable 'a'.

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

Add '-7d' to each side of the equation.
a + 7d + -7d = -13 + -7d

Combine like terms: 7d + -7d = 0
a + 0 = -13 + -7d
a = -13 + -7d

Simplifying
a = -13 + -7d

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