21x=7x+42

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Solution for 21x=7x+42 equation: 


Simplifying
21x = 7x + 42

Reorder the terms:
21x = 42 + 7x

Solving
21x = 42 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21x + -7x = 42 + 7x + -7x

Combine like terms: 21x + -7x = 14x
14x = 42 + 7x + -7x

Combine like terms: 7x + -7x = 0
14x = 42 + 0
14x = 42

Divide each side by '14'.
x = 3

Simplifying
x = 3

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