-a-3+21=5a

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Solution for -a-3+21=5a equation:


Simplifying
-1a + -3 + 21 = 5a

Reorder the terms:
-3 + 21 + -1a = 5a

Combine like terms: -3 + 21 = 18
18 + -1a = 5a

Solving
18 + -1a = 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
18 + -1a + -5a = 5a + -5a

Combine like terms: -1a + -5a = -6a
18 + -6a = 5a + -5a

Combine like terms: 5a + -5a = 0
18 + -6a = 0

Add '-18' to each side of the equation.
18 + -18 + -6a = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -6a = 0 + -18
-6a = 0 + -18

Combine like terms: 0 + -18 = -18
-6a = -18

Divide each side by '-6'.
a = 3

Simplifying
a = 3

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