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2(x+3.5)=12
We move all terms to the left:
2(x+3.5)-(12)=0
We multiply parentheses
2x+7-12=0
We add all the numbers together, and all the variables
2x-5=0
We move all terms containing x to the left, all other terms to the right
2x=5
x=5/2
x=2+1/2
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