-x-9+7x=21

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Solution for -x-9+7x=21 equation: 


Simplifying
-1x + -9 + 7x = 21

Reorder the terms:
-9 + -1x + 7x = 21

Combine like terms: -1x + 7x = 6x
-9 + 6x = 21

Solving
-9 + 6x = 21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 6x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 6x = 21 + 9
6x = 21 + 9

Combine like terms: 21 + 9 = 30
6x = 30

Divide each side by '6'.
x = 5

Simplifying
x = 5

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