20-a=1117

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Solution for 20-a=1117 equation: 


Simplifying
20 + -1a = 1117

Solving
20 + -1a = 1117

Solving for variable 'a'.

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

Add '-20' to each side of the equation.
20 + -20 + -1a = 1117 + -20

Combine like terms: 20 + -20 = 0
0 + -1a = 1117 + -20
-1a = 1117 + -20

Combine like terms: 1117 + -20 = 1097
-1a = 1097

Divide each side by '-1'.
a = -1097

Simplifying
a = -1097

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