78+72+2a=180

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Solution for 78+72+2a=180 equation: 



78+72+2a=180

We move all terms to the left:

78+72+2a-(180)=0

We add all the numbers together, and all the variables

2a-30=0

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

2a=30

a=30/2

a=15

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