-21=3a

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Solution for -21=3a equation:


Simplifying
-21 = 3a

Solving
-21 = 3a

Solving for variable 'a'.

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

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

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

Add '21' to each side of the equation.
-21 + 21 + -3a = 0 + 21

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

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

Divide each side by '-3'.
a = -7

Simplifying
a = -7

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