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6(a+5)=105
We move all terms to the left:
6(a+5)-(105)=0
We multiply parentheses
6a+30-105=0
We add all the numbers together, and all the variables
6a-75=0
We move all terms containing a to the left, all other terms to the right
6a=75
a=75/6
a=12+1/2
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