3(7x)=42

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Solution for 3(7x)=42 equation: 


Simplifying
3(7x) = 42

Remove parenthesis around (7x)
3 * 7x = 42

Multiply 3 * 7
21x = 42

Solving
21x = 42

Solving for variable 'x'.

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

Divide each side by '21'.
x = 2

Simplifying
x = 2

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