10-3a=25

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Solution for 10-3a=25 equation: 


Simplifying
10 + -3a = 25

Solving
10 + -3a = 25

Solving for variable 'a'.

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

Add '-10' to each side of the equation.
10 + -10 + -3a = 25 + -10

Combine like terms: 10 + -10 = 0
0 + -3a = 25 + -10
-3a = 25 + -10

Combine like terms: 25 + -10 = 15
-3a = 15

Divide each side by '-3'.
a = -5

Simplifying
a = -5

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