20=4-2a

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Solution for 20=4-2a equation:


Simplifying
20 = 4 + -2a

Solving
20 = 4 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
20 + 2a = 4 + -2a + 2a

Combine like terms: -2a + 2a = 0
20 + 2a = 4 + 0
20 + 2a = 4

Add '-20' to each side of the equation.
20 + -20 + 2a = 4 + -20

Combine like terms: 20 + -20 = 0
0 + 2a = 4 + -20
2a = 4 + -20

Combine like terms: 4 + -20 = -16
2a = -16

Divide each side by '2'.
a = -8

Simplifying
a = -8

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