100-2a=20-a

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Solution for 100-2a=20-a equation:


Simplifying
100 + -2a = 20 + -1a

Solving
100 + -2a = 20 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
100 + -2a + a = 20 + -1a + a

Combine like terms: -2a + a = -1a
100 + -1a = 20 + -1a + a

Combine like terms: -1a + a = 0
100 + -1a = 20 + 0
100 + -1a = 20

Add '-100' to each side of the equation.
100 + -100 + -1a = 20 + -100

Combine like terms: 100 + -100 = 0
0 + -1a = 20 + -100
-1a = 20 + -100

Combine like terms: 20 + -100 = -80
-1a = -80

Divide each side by '-1'.
a = 80

Simplifying
a = 80

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