a+a+2.5a=180

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Solution for a+a+2.5a=180 equation: 


Simplifying
a + a + 2.5a = 180

Combine like terms: a + a = 2a
2a + 2.5a = 180

Combine like terms: 2a + 2.5a = 4.5a
4.5a = 180

Solving
4.5a = 180

Solving for variable 'a'.

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

Divide each side by '4.5'.
a = 40

Simplifying
a = 40

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