3x+9=42

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Solution for 3x+9=42 equation: 


Simplifying
3x + 9 = 42

Reorder the terms:
9 + 3x = 42

Solving
9 + 3x = 42

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 42 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 42 + -9
3x = 42 + -9

Combine like terms: 42 + -9 = 33
3x = 33

Divide each side by '3'.
x = 11

Simplifying
x = 11

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