25=13-4s

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Solution for 25=13-4s equation: 


Simplifying
25 = 13 + -4s

Solving
25 = 13 + -4s

Solving for variable 's'.

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

Add '4s' to each side of the equation.
25 + 4s = 13 + -4s + 4s

Combine like terms: -4s + 4s = 0
25 + 4s = 13 + 0
25 + 4s = 13

Add '-25' to each side of the equation.
25 + -25 + 4s = 13 + -25

Combine like terms: 25 + -25 = 0
0 + 4s = 13 + -25
4s = 13 + -25

Combine like terms: 13 + -25 = -12
4s = -12

Divide each side by '4'.
s = -3

Simplifying
s = -3

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