9a=4(a+20)

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


Simplifying
9a = 4(a + 20)

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

Solving
9a = 80 + 4a

Solving for variable 'a'.

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

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

Combine like terms: 9a + -4a = 5a
5a = 80 + 4a + -4a

Combine like terms: 4a + -4a = 0
5a = 80 + 0
5a = 80

Divide each side by '5'.
a = 16

Simplifying
a = 16

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