3a+-21=2a

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Solution for 3a+-21=2a equation:


Simplifying
3a + -21 = 2a

Reorder the terms:
-21 + 3a = 2a

Solving
-21 + 3a = 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
-21 + 3a + -2a = 2a + -2a

Combine like terms: 3a + -2a = 1a
-21 + 1a = 2a + -2a

Combine like terms: 2a + -2a = 0
-21 + 1a = 0

Add '21' to each side of the equation.
-21 + 21 + 1a = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 1a = 0 + 21
1a = 0 + 21

Combine like terms: 0 + 21 = 21
1a = 21

Divide each side by '1'.
a = 21

Simplifying
a = 21

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