a+4a=90

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Solution for a+4a=90 equation: 


Simplifying
a + 4a = 90

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

Solving
5a = 90

Solving for variable 'a'.

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

Divide each side by '5'.
a = 18

Simplifying
a = 18

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