20-[x+9]=4x-4

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Solution for 20-[x+9]=4x-4 equation:


Simplifying
20 + -1[x + 9] = 4x + -4

Reorder the terms:
20 + -1[9 + x] = 4x + -4
20 + [9 * -1 + x * -1] = 4x + -4
20 + [-9 + -1x] = 4x + -4

Combine like terms: 20 + -9 = 11
11 + -1x = 4x + -4

Reorder the terms:
11 + -1x = -4 + 4x

Solving
11 + -1x = -4 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
11 + -1x + -4x = -4 + 4x + -4x

Combine like terms: -1x + -4x = -5x
11 + -5x = -4 + 4x + -4x

Combine like terms: 4x + -4x = 0
11 + -5x = -4 + 0
11 + -5x = -4

Add '-11' to each side of the equation.
11 + -11 + -5x = -4 + -11

Combine like terms: 11 + -11 = 0
0 + -5x = -4 + -11
-5x = -4 + -11

Combine like terms: -4 + -11 = -15
-5x = -15

Divide each side by '-5'.
x = 3

Simplifying
x = 3

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