6x-42=21-x

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Solution for 6x-42=21-x equation:


Simplifying
6x + -42 = 21 + -1x

Reorder the terms:
-42 + 6x = 21 + -1x

Solving
-42 + 6x = 21 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
-42 + 6x + x = 21 + -1x + x

Combine like terms: 6x + x = 7x
-42 + 7x = 21 + -1x + x

Combine like terms: -1x + x = 0
-42 + 7x = 21 + 0
-42 + 7x = 21

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

Combine like terms: -42 + 42 = 0
0 + 7x = 21 + 42
7x = 21 + 42

Combine like terms: 21 + 42 = 63
7x = 63

Divide each side by '7'.
x = 9

Simplifying
x = 9

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