20=a-b

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Solution for 20=a-b equation:


Simplifying
20 = a + -1b

Solving
20 = a + -1b

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.
20 + -1a = a + -1a + -1b

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

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

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

Divide each side by '-1'.
a = 20 + b

Simplifying
a = 20 + b

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