a-3=21+8+a-3a

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Solution for a-3=21+8+a-3a equation: 


Simplifying
a + -3 = 21 + 8 + a + -3a

Reorder the terms:
-3 + a = 21 + 8 + a + -3a

Combine like terms: 21 + 8 = 29
-3 + a = 29 + a + -3a

Combine like terms: a + -3a = -2a
-3 + a = 29 + -2a

Solving
-3 + a = 29 + -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.
-3 + a + 2a = 29 + -2a + 2a

Combine like terms: a + 2a = 3a
-3 + 3a = 29 + -2a + 2a

Combine like terms: -2a + 2a = 0
-3 + 3a = 29 + 0
-3 + 3a = 29

Add '3' to each side of the equation.
-3 + 3 + 3a = 29 + 3

Combine like terms: -3 + 3 = 0
0 + 3a = 29 + 3
3a = 29 + 3

Combine like terms: 29 + 3 = 32
3a = 32

Divide each side by '3'.
a = 10.66666667

Simplifying
a = 10.66666667

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