15-(-8a)=-25

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Solution for 15-(-8a)=-25 equation:


Simplifying
15 + -1(-8a) = -25

Remove parenthesis around (-8a)
15 + -1 * -8a = -25

Multiply -1 * -8
15 + 8a = -25

Solving
15 + 8a = -25

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + 8a = -25 + -15

Combine like terms: 15 + -15 = 0
0 + 8a = -25 + -15
8a = -25 + -15

Combine like terms: -25 + -15 = -40
8a = -40

Divide each side by '8'.
a = -5

Simplifying
a = -5

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