8x+4x-84=42-9x

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Solution for 8x+4x-84=42-9x equation:


Simplifying
8x + 4x + -84 = 42 + -9x

Reorder the terms:
-84 + 8x + 4x = 42 + -9x

Combine like terms: 8x + 4x = 12x
-84 + 12x = 42 + -9x

Solving
-84 + 12x = 42 + -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.
-84 + 12x + 9x = 42 + -9x + 9x

Combine like terms: 12x + 9x = 21x
-84 + 21x = 42 + -9x + 9x

Combine like terms: -9x + 9x = 0
-84 + 21x = 42 + 0
-84 + 21x = 42

Add '84' to each side of the equation.
-84 + 84 + 21x = 42 + 84

Combine like terms: -84 + 84 = 0
0 + 21x = 42 + 84
21x = 42 + 84

Combine like terms: 42 + 84 = 126
21x = 126

Divide each side by '21'.
x = 6

Simplifying
x = 6

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