-21=a-3+8a

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Solution for -21=a-3+8a equation:


Simplifying
-21 = a + -3 + 8a

Reorder the terms:
-21 = -3 + a + 8a

Combine like terms: a + 8a = 9a
-21 = -3 + 9a

Solving
-21 = -3 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
-21 + -9a = -3 + 9a + -9a

Combine like terms: 9a + -9a = 0
-21 + -9a = -3 + 0
-21 + -9a = -3

Add '21' to each side of the equation.
-21 + 21 + -9a = -3 + 21

Combine like terms: -21 + 21 = 0
0 + -9a = -3 + 21
-9a = -3 + 21

Combine like terms: -3 + 21 = 18
-9a = 18

Divide each side by '-9'.
a = -2

Simplifying
a = -2

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