16-12a-13a=-9

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Solution for 16-12a-13a=-9 equation: 


Simplifying
16 + -12a + -13a = -9

Combine like terms: -12a + -13a = -25a
16 + -25a = -9

Solving
16 + -25a = -9

Solving for variable 'a'.

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

Add '-16' to each side of the equation.
16 + -16 + -25a = -9 + -16

Combine like terms: 16 + -16 = 0
0 + -25a = -9 + -16
-25a = -9 + -16

Combine like terms: -9 + -16 = -25
-25a = -25

Divide each side by '-25'.
a = 1

Simplifying
a = 1

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