3(a+1)=21-6a

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Solution for 3(a+1)=21-6a equation:


Simplifying
3(a + 1) = 21 + -6a

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

Solving
3 + 3a = 21 + -6a

Solving for variable 'a'.

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

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

Combine like terms: 3a + 6a = 9a
3 + 9a = 21 + -6a + 6a

Combine like terms: -6a + 6a = 0
3 + 9a = 21 + 0
3 + 9a = 21

Add '-3' to each side of the equation.
3 + -3 + 9a = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 9a = 21 + -3
9a = 21 + -3

Combine like terms: 21 + -3 = 18
9a = 18

Divide each side by '9'.
a = 2

Simplifying
a = 2

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