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3x/10-3=12
We move all terms to the left:
3x/10-3-(12)=0
We add all the numbers together, and all the variables
3x/10-15=0
We multiply all the terms by the denominator
3x-15*10=0
We add all the numbers together, and all the variables
3x-150=0
We move all terms containing x to the left, all other terms to the right
3x=150
x=150/3
x=50
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