21x=42+15x

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Solution for 21x=42+15x equation: 


Simplifying
21x = 42 + 15x

Solving
21x = 42 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
21x + -15x = 42 + 15x + -15x

Combine like terms: 21x + -15x = 6x
6x = 42 + 15x + -15x

Combine like terms: 15x + -15x = 0
6x = 42 + 0
6x = 42

Divide each side by '6'.
x = 7

Simplifying
x = 7

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