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9x/40=12
We move all terms to the left:
9x/40-(12)=0
We multiply all the terms by the denominator
9x-12*40=0
We add all the numbers together, and all the variables
9x-480=0
We move all terms containing x to the left, all other terms to the right
9x=480
x=480/9
x=53+1/3
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