7a-90=a

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Solution for 7a-90=a equation:


Simplifying
7a + -90 = a

Reorder the terms:
-90 + 7a = a

Solving
-90 + 7a = 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.
-90 + 7a + -1a = a + -1a

Combine like terms: 7a + -1a = 6a
-90 + 6a = a + -1a

Combine like terms: a + -1a = 0
-90 + 6a = 0

Add '90' to each side of the equation.
-90 + 90 + 6a = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 6a = 0 + 90
6a = 0 + 90

Combine like terms: 0 + 90 = 90
6a = 90

Divide each side by '6'.
a = 15

Simplifying
a = 15

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