90+5a-5=180

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



90+5a-5=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

5a-95=0

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

5a=95

a=95/5

a=19

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