4+x=13

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Solution for 4+x=13 equation: 


Simplifying
4 + x = 13

Solving
4 + x = 13

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + x = 13 + -4

Combine like terms: 4 + -4 = 0
0 + x = 13 + -4
x = 13 + -4

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

Simplifying
x = 9

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