12x+9x=84

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Solution for 12x+9x=84 equation: 


Simplifying
12x + 9x = 84

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

Solving
21x = 84

Solving for variable 'x'.

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

Divide each side by '21'.
x = 4

Simplifying
x = 4

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