6(a+1)=21

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Solution for 6(a+1)=21 equation: 


Simplifying
6(a + 1) = 21

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

Solving
6 + 6a = 21

Solving for variable 'a'.

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

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

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

Combine like terms: 21 + -6 = 15
6a = 15

Divide each side by '6'.
a = 2.5

Simplifying
a = 2.5

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