4a-25a=21

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Solution for 4a-25a=21 equation: 


Simplifying
4a + -25a = 21

Combine like terms: 4a + -25a = -21a
-21a = 21

Solving
-21a = 21

Solving for variable 'a'.

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

Divide each side by '-21'.
a = -1

Simplifying
a = -1

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