8x+4x-21=84-9x

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Solution for 8x+4x-21=84-9x equation:


Simplifying
8x + 4x + -21 = 84 + -9x

Reorder the terms:
-21 + 8x + 4x = 84 + -9x

Combine like terms: 8x + 4x = 12x
-21 + 12x = 84 + -9x

Solving
-21 + 12x = 84 + -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.
-21 + 12x + 9x = 84 + -9x + 9x

Combine like terms: 12x + 9x = 21x
-21 + 21x = 84 + -9x + 9x

Combine like terms: -9x + 9x = 0
-21 + 21x = 84 + 0
-21 + 21x = 84

Add '21' to each side of the equation.
-21 + 21 + 21x = 84 + 21

Combine like terms: -21 + 21 = 0
0 + 21x = 84 + 21
21x = 84 + 21

Combine like terms: 84 + 21 = 105
21x = 105

Divide each side by '21'.
x = 5

Simplifying
x = 5

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