9=9-1x

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Solution for 9=9-1x equation: 


Simplifying
9 = 9 + -1x

Add '-9' to each side of the equation.
9 + -9 = 9 + -9 + -1x

Combine like terms: 9 + -9 = 0
0 = 9 + -9 + -1x

Combine like terms: 9 + -9 = 0
0 = 0 + -1x
0 = -1x

Solving
0 = -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.
0 + x = -1x + x
Remove the zero:
x = -1x + x

Combine like terms: -1x + x = 0
x = 0

Simplifying
x = 0

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