s-9=4

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Solution for s-9=4 equation: 


Simplifying
s + -9 = 4

Reorder the terms:
-9 + s = 4

Solving
-9 + s = 4

Solving for variable 's'.

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

Add '9' to each side of the equation.
-9 + 9 + s = 4 + 9

Combine like terms: -9 + 9 = 0
0 + s = 4 + 9
s = 4 + 9

Combine like terms: 4 + 9 = 13
s = 13

Simplifying
s = 13

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