3+9+x=30

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Solution for 3+9+x=30 equation: 


Simplifying
3 + 9 + x = 30

Combine like terms: 3 + 9 = 12
12 + x = 30

Solving
12 + x = 30

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + x = 30 + -12

Combine like terms: 12 + -12 = 0
0 + x = 30 + -12
x = 30 + -12

Combine like terms: 30 + -12 = 18
x = 18

Simplifying
x = 18

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