72=20-8a

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Solution for 72=20-8a equation:


Simplifying
72 = 20 + -8a

Solving
72 = 20 + -8a

Solving for variable 'a'.

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

Add '8a' to each side of the equation.
72 + 8a = 20 + -8a + 8a

Combine like terms: -8a + 8a = 0
72 + 8a = 20 + 0
72 + 8a = 20

Add '-72' to each side of the equation.
72 + -72 + 8a = 20 + -72

Combine like terms: 72 + -72 = 0
0 + 8a = 20 + -72
8a = 20 + -72

Combine like terms: 20 + -72 = -52
8a = -52

Divide each side by '8'.
a = -6.5

Simplifying
a = -6.5

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