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

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


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

Combine like terms: a + a = 2a
6(2a) = 21 + -3(1 + -2a)

Remove parenthesis around (2a)
6 * 2a = 21 + -3(1 + -2a)

Multiply 6 * 2
12a = 21 + -3(1 + -2a)
12a = 21 + (1 * -3 + -2a * -3)
12a = 21 + (-3 + 6a)

Combine like terms: 21 + -3 = 18
12a = 18 + 6a

Solving
12a = 18 + 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.
12a + -6a = 18 + 6a + -6a

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

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

Divide each side by '6'.
a = 3

Simplifying
a = 3

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