4a-21=3-2a

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Solution for 4a-21=3-2a equation:


Simplifying
4a + -21 = 3 + -2a

Reorder the terms:
-21 + 4a = 3 + -2a

Solving
-21 + 4a = 3 + -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 + 4a + 2a = 3 + -2a + 2a

Combine like terms: 4a + 2a = 6a
-21 + 6a = 3 + -2a + 2a

Combine like terms: -2a + 2a = 0
-21 + 6a = 3 + 0
-21 + 6a = 3

Add '21' to each side of the equation.
-21 + 21 + 6a = 3 + 21

Combine like terms: -21 + 21 = 0
0 + 6a = 3 + 21
6a = 3 + 21

Combine like terms: 3 + 21 = 24
6a = 24

Divide each side by '6'.
a = 4

Simplifying
a = 4

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