8x-4x-9-6=21

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Solution for 8x-4x-9-6=21 equation:


Simplifying
8x + -4x + -9 + -6 = 21

Reorder the terms:
-9 + -6 + 8x + -4x = 21

Combine like terms: -9 + -6 = -15
-15 + 8x + -4x = 21

Combine like terms: 8x + -4x = 4x
-15 + 4x = 21

Solving
-15 + 4x = 21

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 4x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4x = 21 + 15
4x = 21 + 15

Combine like terms: 21 + 15 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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