-21a=8-25a

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Solution for -21a=8-25a equation: 


Simplifying
-21a = 8 + -25a

Solving
-21a = 8 + -25a

Solving for variable 'a'.

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

Add '25a' to each side of the equation.
-21a + 25a = 8 + -25a + 25a

Combine like terms: -21a + 25a = 4a
4a = 8 + -25a + 25a

Combine like terms: -25a + 25a = 0
4a = 8 + 0
4a = 8

Divide each side by '4'.
a = 2

Simplifying
a = 2

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