100=a-9

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Solution for 100=a-9 equation:


Simplifying
100 = a + -9

Reorder the terms:
100 = -9 + a

Solving
100 = -9 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
100 + -1a = -9 + a + -1a

Combine like terms: a + -1a = 0
100 + -1a = -9 + 0
100 + -1a = -9

Add '-100' to each side of the equation.
100 + -100 + -1a = -9 + -100

Combine like terms: 100 + -100 = 0
0 + -1a = -9 + -100
-1a = -9 + -100

Combine like terms: -9 + -100 = -109
-1a = -109

Divide each side by '-1'.
a = 109

Simplifying
a = 109

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