109=9-10a

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Solution for 109=9-10a equation:


Simplifying
109 = 9 + -10a

Solving
109 = 9 + -10a

Solving for variable 'a'.

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

Add '10a' to each side of the equation.
109 + 10a = 9 + -10a + 10a

Combine like terms: -10a + 10a = 0
109 + 10a = 9 + 0
109 + 10a = 9

Add '-109' to each side of the equation.
109 + -109 + 10a = 9 + -109

Combine like terms: 109 + -109 = 0
0 + 10a = 9 + -109
10a = 9 + -109

Combine like terms: 9 + -109 = -100
10a = -100

Divide each side by '10'.
a = -10

Simplifying
a = -10

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