4(a+20)=9

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Solution for 4(a+20)=9 equation: 


Simplifying
4(a + 20) = 9

Reorder the terms:
4(20 + a) = 9
(20 * 4 + a * 4) = 9
(80 + 4a) = 9

Solving
80 + 4a = 9

Solving for variable 'a'.

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

Add '-80' to each side of the equation.
80 + -80 + 4a = 9 + -80

Combine like terms: 80 + -80 = 0
0 + 4a = 9 + -80
4a = 9 + -80

Combine like terms: 9 + -80 = -71
4a = -71

Divide each side by '4'.
a = -17.75

Simplifying
a = -17.75

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