25=a+13-4s

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Solution for 25=a+13-4s equation:


Simplifying
25 = a + 13 + -4s

Reorder the terms:
25 = 13 + a + -4s

Solving
25 = 13 + a + -4s

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
25 + -1a = 13 + a + -1a + -4s

Combine like terms: a + -1a = 0
25 + -1a = 13 + 0 + -4s
25 + -1a = 13 + -4s

Add '-25' to each side of the equation.
25 + -25 + -1a = 13 + -25 + -4s

Combine like terms: 25 + -25 = 0
0 + -1a = 13 + -25 + -4s
-1a = 13 + -25 + -4s

Combine like terms: 13 + -25 = -12
-1a = -12 + -4s

Divide each side by '-1'.
a = 12 + 4s

Simplifying
a = 12 + 4s

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