87+3a+a+7=180

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Solution for 87+3a+a+7=180 equation: 



87+3a+a+7=180

We move all terms to the left:

87+3a+a+7-(180)=0

We add all the numbers together, and all the variables

4a-86=0

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

4a=86

a=86/4

a=21+1/2

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