(a-5)+(a+5)+90=180

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Solution for (a-5)+(a+5)+90=180 equation: 



(a-5)+(a+5)+90=180

We move all terms to the left:

(a-5)+(a+5)+90-(180)=0

We add all the numbers together, and all the variables

(a-5)+(a+5)-90=0

We get rid of parentheses

a+a-5+5-90=0

We add all the numbers together, and all the variables

2a-90=0

We move all terms containing a to the left, all other terms to the right

2a=90

a=90/2

a=45

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