-10a+25a=-30

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Solution for -10a+25a=-30 equation: 


Simplifying
-10a + 25a = -30

Combine like terms: -10a + 25a = 15a
15a = -30

Solving
15a = -30

Solving for variable 'a'.

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

Divide each side by '15'.
a = -2

Simplifying
a = -2

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