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3x/5+3=12
We move all terms to the left:
3x/5+3-(12)=0
We add all the numbers together, and all the variables
3x/5-9=0
We multiply all the terms by the denominator
3x-9*5=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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