100+4a=180

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Solution for 100+4a=180 equation: 



100+4a=180

We move all terms to the left:

100+4a-(180)=0

We add all the numbers together, and all the variables

4a-80=0

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

4a=80

a=80/4

a=20

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