9-3(-2x+4)=21

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Solution for 9-3(-2x+4)=21 equation: 


Simplifying
9 + -3(-2x + 4) = 21

Reorder the terms:
9 + -3(4 + -2x) = 21
9 + (4 * -3 + -2x * -3) = 21
9 + (-12 + 6x) = 21

Combine like terms: 9 + -12 = -3
-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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