21x+84=9x

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Solution for 21x+84=9x equation:


Simplifying
21x + 84 = 9x

Reorder the terms:
84 + 21x = 9x

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

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

Combine like terms: 9x + -9x = 0
84 + 12x = 0

Add '-84' to each side of the equation.
84 + -84 + 12x = 0 + -84

Combine like terms: 84 + -84 = 0
0 + 12x = 0 + -84
12x = 0 + -84

Combine like terms: 0 + -84 = -84
12x = -84

Divide each side by '12'.
x = -7

Simplifying
x = -7

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