20-1a=-10

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Solution for 20-1a=-10 equation: 


Simplifying
20 + -1a = -10

Solving
20 + -1a = -10

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 = -10 + -20

Combine like terms: 20 + -20 = 0
0 + -1a = -10 + -20
-1a = -10 + -20

Combine like terms: -10 + -20 = -30
-1a = -30

Divide each side by '-1'.
a = 30

Simplifying
a = 30

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