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a/2-50=130
We move all terms to the left:
a/2-50-(130)=0
We add all the numbers together, and all the variables
a/2-180=0
We multiply all the terms by the denominator
a-180*2=0
We add all the numbers together, and all the variables
a-360=0
We move all terms containing a to the left, all other terms to the right
a=360
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