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12(a-2)=50
We move all terms to the left:
12(a-2)-(50)=0
We multiply parentheses
12a-24-50=0
We add all the numbers together, and all the variables
12a-74=0
We move all terms containing a to the left, all other terms to the right
12a=74
a=74/12
a=6+1/6
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