7a+21=42

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Solution for 7a+21=42 equation: 


Simplifying
7a + 21 = 42

Reorder the terms:
21 + 7a = 42

Solving
21 + 7a = 42

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + 7a = 42 + -21

Combine like terms: 21 + -21 = 0
0 + 7a = 42 + -21
7a = 42 + -21

Combine like terms: 42 + -21 = 21
7a = 21

Divide each side by '7'.
a = 3

Simplifying
a = 3

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