6(3+a)=21-3(2a-1)

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Solution for 6(3+a)=21-3(2a-1) equation:


Simplifying
6(3 + a) = 21 + -3(2a + -1)
(3 * 6 + a * 6) = 21 + -3(2a + -1)
(18 + 6a) = 21 + -3(2a + -1)

Reorder the terms:
18 + 6a = 21 + -3(-1 + 2a)
18 + 6a = 21 + (-1 * -3 + 2a * -3)
18 + 6a = 21 + (3 + -6a)

Combine like terms: 21 + 3 = 24
18 + 6a = 24 + -6a

Solving
18 + 6a = 24 + -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.
18 + 6a + 6a = 24 + -6a + 6a

Combine like terms: 6a + 6a = 12a
18 + 12a = 24 + -6a + 6a

Combine like terms: -6a + 6a = 0
18 + 12a = 24 + 0
18 + 12a = 24

Add '-18' to each side of the equation.
18 + -18 + 12a = 24 + -18

Combine like terms: 18 + -18 = 0
0 + 12a = 24 + -18
12a = 24 + -18

Combine like terms: 24 + -18 = 6
12a = 6

Divide each side by '12'.
a = 0.5

Simplifying
a = 0.5

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