25=13-4a

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Solution for 25=13-4a equation:


Simplifying
25 = 13 + -4a

Solving
25 = 13 + -4a

Solving for variable 'a'.

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

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

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

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

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

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

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

Simplifying
a = -3

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