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3(9+x)=75
We move all terms to the left:
3(9+x)-(75)=0
We add all the numbers together, and all the variables
3(x+9)-75=0
We multiply parentheses
3x+27-75=0
We add all the numbers together, and all the variables
3x-48=0
We move all terms containing x to the left, all other terms to the right
3x=48
x=48/3
x=16
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