90+5a+4a=180

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Solution for 90+5a+4a=180 equation: 


Simplifying
90 + 5a + 4a = 180

Combine like terms: 5a + 4a = 9a
90 + 9a = 180

Solving
90 + 9a = 180

Solving for variable 'a'.

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

Add '-90' to each side of the equation.
90 + -90 + 9a = 180 + -90

Combine like terms: 90 + -90 = 0
0 + 9a = 180 + -90
9a = 180 + -90

Combine like terms: 180 + -90 = 90
9a = 90

Divide each side by '9'.
a = 10

Simplifying
a = 10

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