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7.5+x/3=6.5
We move all terms to the left:
7.5+x/3-(6.5)=0
We add all the numbers together, and all the variables
x/3+1=0
We multiply all the terms by the denominator
x+1*3=0
We add all the numbers together, and all the variables
x+3=0
We move all terms containing x to the left, all other terms to the right
x=-3
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