-3-25a=15

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Solution for -3-25a=15 equation: 


Simplifying
-3 + -25a = 15

Solving
-3 + -25a = 15

Solving for variable 'a'.

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

Add '3' to each side of the equation.
-3 + 3 + -25a = 15 + 3

Combine like terms: -3 + 3 = 0
0 + -25a = 15 + 3
-25a = 15 + 3

Combine like terms: 15 + 3 = 18
-25a = 18

Divide each side by '-25'.
a = -0.72

Simplifying
a = -0.72

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