-3[2x+1]=21

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Solution for -3[2x+1]=21 equation: 


Simplifying
-3[2x + 1] = 21

Reorder the terms:
-3[1 + 2x] = 21
[1 * -3 + 2x * -3] = 21
[-3 + -6x] = 21

Solving
-3 + -6x = 21

Solving for variable 'x'.

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

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

Combine like terms: -3 + 3 = 0
0 + -6x = 21 + 3
-6x = 21 + 3

Combine like terms: 21 + 3 = 24
-6x = 24

Divide each side by '-6'.
x = -4

Simplifying
x = -4

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