-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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