9=13+x

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Solution for 9=13+x equation: 


Simplifying
9 = 13 + x

Solving
9 = 13 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
9 + -1x = 13 + x + -1x

Combine like terms: x + -1x = 0
9 + -1x = 13 + 0
9 + -1x = 13

Add '-9' to each side of the equation.
9 + -9 + -1x = 13 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 13 + -9
-1x = 13 + -9

Combine like terms: 13 + -9 = 4
-1x = 4

Divide each side by '-1'.
x = -4

Simplifying
x = -4

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