7a-28=21

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Solution for 7a-28=21 equation: 


Simplifying
7a + -28 = 21

Reorder the terms:
-28 + 7a = 21

Solving
-28 + 7a = 21

Solving for variable 'a'.

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

Add '28' to each side of the equation.
-28 + 28 + 7a = 21 + 28

Combine like terms: -28 + 28 = 0
0 + 7a = 21 + 28
7a = 21 + 28

Combine like terms: 21 + 28 = 49
7a = 49

Divide each side by '7'.
a = 7

Simplifying
a = 7

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