9x+84=21x

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Solution for 9x+84=21x equation:


Simplifying
9x + 84 = 21x

Reorder the terms:
84 + 9x = 21x

Solving
84 + 9x = 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
84 + 9x + -21x = 21x + -21x

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

Combine like terms: 21x + -21x = 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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