x-7x=21-3x

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Solution for x-7x=21-3x equation: 


Simplifying
x + -7x = 21 + -3x

Combine like terms: x + -7x = -6x
-6x = 21 + -3x

Solving
-6x = 21 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-6x + 3x = 21 + -3x + 3x

Combine like terms: -6x + 3x = -3x
-3x = 21 + -3x + 3x

Combine like terms: -3x + 3x = 0
-3x = 21 + 0
-3x = 21

Divide each side by '-3'.
x = -7

Simplifying
x = -7

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