15=3[1-2a]

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Solution for 15=3[1-2a] equation:


Simplifying
15 = 3[1 + -2a]
15 = [1 * 3 + -2a * 3]
15 = [3 + -6a]

Solving
15 = 3 + -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.
15 + 6a = 3 + -6a + 6a

Combine like terms: -6a + 6a = 0
15 + 6a = 3 + 0
15 + 6a = 3

Add '-15' to each side of the equation.
15 + -15 + 6a = 3 + -15

Combine like terms: 15 + -15 = 0
0 + 6a = 3 + -15
6a = 3 + -15

Combine like terms: 3 + -15 = -12
6a = -12

Divide each side by '6'.
a = -2

Simplifying
a = -2

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