3+x-9=21

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Solution for 3+x-9=21 equation: 


Simplifying
3 + x + -9 = 21

Reorder the terms:
3 + -9 + x = 21

Combine like terms: 3 + -9 = -6
-6 + x = 21

Solving
-6 + x = 21

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + x = 21 + 6

Combine like terms: -6 + 6 = 0
0 + x = 21 + 6
x = 21 + 6

Combine like terms: 21 + 6 = 27
x = 27

Simplifying
x = 27

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