-21=7a

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Solution for -21=7a equation:


Simplifying
-21 = 7a

Solving
-21 = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
-21 + -7a = 7a + -7a

Combine like terms: 7a + -7a = 0
-21 + -7a = 0

Add '21' to each side of the equation.
-21 + 21 + -7a = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -7a = 0 + 21
-7a = 0 + 21

Combine like terms: 0 + 21 = 21
-7a = 21

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

Simplifying
a = -3

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