25=a+13-4a

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


Simplifying
25 = a + 13 + -4a

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

Combine like terms: a + -4a = -3a
25 = 13 + -3a

Solving
25 = 13 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
25 + 3a = 13 + -3a + 3a

Combine like terms: -3a + 3a = 0
25 + 3a = 13 + 0
25 + 3a = 13

Add '-25' to each side of the equation.
25 + -25 + 3a = 13 + -25

Combine like terms: 25 + -25 = 0
0 + 3a = 13 + -25
3a = 13 + -25

Combine like terms: 13 + -25 = -12
3a = -12

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

Simplifying
a = -4

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