21-(x+5)=9x-4

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Solution for 21-(x+5)=9x-4 equation:


Simplifying
21 + -1(x + 5) = 9x + -4

Reorder the terms:
21 + -1(5 + x) = 9x + -4
21 + (5 * -1 + x * -1) = 9x + -4
21 + (-5 + -1x) = 9x + -4

Combine like terms: 21 + -5 = 16
16 + -1x = 9x + -4

Reorder the terms:
16 + -1x = -4 + 9x

Solving
16 + -1x = -4 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
16 + -1x + -9x = -4 + 9x + -9x

Combine like terms: -1x + -9x = -10x
16 + -10x = -4 + 9x + -9x

Combine like terms: 9x + -9x = 0
16 + -10x = -4 + 0
16 + -10x = -4

Add '-16' to each side of the equation.
16 + -16 + -10x = -4 + -16

Combine like terms: 16 + -16 = 0
0 + -10x = -4 + -16
-10x = -4 + -16

Combine like terms: -4 + -16 = -20
-10x = -20

Divide each side by '-10'.
x = 2

Simplifying
x = 2

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