3(2a+1)=21

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Solution for 3(2a+1)=21 equation: 


Simplifying
3(2a + 1) = 21

Reorder the terms:
3(1 + 2a) = 21
(1 * 3 + 2a * 3) = 21
(3 + 6a) = 21

Solving
3 + 6a = 21

Solving for variable 'a'.

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

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

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

Combine like terms: 21 + -3 = 18
6a = 18

Divide each side by '6'.
a = 3

Simplifying
a = 3

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