6+3*X=42

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Solution for 6+3*X=42 equation: 


Simplifying
6 + 3X = 42

Solving
6 + 3X = 42

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 + 3X = 42 + -6

Combine like terms: 6 + -6 = 0
0 + 3X = 42 + -6
3X = 42 + -6

Combine like terms: 42 + -6 = 36
3X = 36

Divide each side by '3'.
X = 12

Simplifying
X = 12

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