9+2[X-4]=21

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Solution for 9+2[X-4]=21 equation:


Simplifying
9 + 2[X + -4] = 21

Reorder the terms:
9 + 2[-4 + X] = 21
9 + [-4 * 2 + X * 2] = 21
9 + [-8 + 2X] = 21

Combine like terms: 9 + -8 = 1
1 + 2X = 21

Solving
1 + 2X = 21

Solving for variable 'X'.

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

Add '-1' to each side of the equation.
1 + -1 + 2X = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 2X = 21 + -1
2X = 21 + -1

Combine like terms: 21 + -1 = 20
2X = 20

Divide each side by '2'.
X = 10

Simplifying
X = 10

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