3(2x-4)=21

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Solution for 3(2x-4)=21 equation: 


Simplifying
3(2x + -4) = 21

Reorder the terms:
3(-4 + 2x) = 21
(-4 * 3 + 2x * 3) = 21
(-12 + 6x) = 21

Solving
-12 + 6x = 21

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 6x = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 6x = 21 + 12
6x = 21 + 12

Combine like terms: 21 + 12 = 33
6x = 33

Divide each side by '6'.
x = 5.5

Simplifying
x = 5.5

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