3a-2=21

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Solution for 3a-2=21 equation: 


Simplifying
3a + -2 = 21

Reorder the terms:
-2 + 3a = 21

Solving
-2 + 3a = 21

Solving for variable 'a'.

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

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

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

Combine like terms: 21 + 2 = 23
3a = 23

Divide each side by '3'.
a = 7.666666667

Simplifying
a = 7.666666667

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