3[2a-5]=21

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Solution for 3[2a-5]=21 equation:


Simplifying
3[2a + -5] = 21

Reorder the terms:
3[-5 + 2a] = 21
[-5 * 3 + 2a * 3] = 21
[-15 + 6a] = 21

Solving
-15 + 6a = 21

Solving for variable 'a'.

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

Add '15' to each side of the equation.
-15 + 15 + 6a = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 6a = 21 + 15
6a = 21 + 15

Combine like terms: 21 + 15 = 36
6a = 36

Divide each side by '6'.
a = 6

Simplifying
a = 6

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