3a+5=21-a

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Solution for 3a+5=21-a equation:


Simplifying
3a + 5 = 21 + -1a

Reorder the terms:
5 + 3a = 21 + -1a

Solving
5 + 3a = 21 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
5 + 3a + a = 21 + -1a + a

Combine like terms: 3a + a = 4a
5 + 4a = 21 + -1a + a

Combine like terms: -1a + a = 0
5 + 4a = 21 + 0
5 + 4a = 21

Add '-5' to each side of the equation.
5 + -5 + 4a = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4a = 21 + -5
4a = 21 + -5

Combine like terms: 21 + -5 = 16
4a = 16

Divide each side by '4'.
a = 4

Simplifying
a = 4

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