3+x=42

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Solution for 3+x=42 equation: 


Simplifying
3 + x = 42

Solving
3 + x = 42

Solving for variable 'x'.

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

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

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

Combine like terms: 42 + -3 = 39
x = 39

Simplifying
x = 39

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