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2(a-2)=7
We move all terms to the left:
2(a-2)-(7)=0
We multiply parentheses
2a-4-7=0
We add all the numbers together, and all the variables
2a-11=0
We move all terms containing a to the left, all other terms to the right
2a=11
a=11/2
a=5+1/2
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