9x-21=4x+4

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Solution for 9x-21=4x+4 equation:


Simplifying
9x + -21 = 4x + 4

Reorder the terms:
-21 + 9x = 4x + 4

Reorder the terms:
-21 + 9x = 4 + 4x

Solving
-21 + 9x = 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.
-21 + 9x + -4x = 4 + 4x + -4x

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

Combine like terms: 4x + -4x = 0
-21 + 5x = 4 + 0
-21 + 5x = 4

Add '21' to each side of the equation.
-21 + 21 + 5x = 4 + 21

Combine like terms: -21 + 21 = 0
0 + 5x = 4 + 21
5x = 4 + 21

Combine like terms: 4 + 21 = 25
5x = 25

Divide each side by '5'.
x = 5

Simplifying
x = 5

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