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6x-(12+3x)=3
We move all terms to the left:
6x-(12+3x)-(3)=0
We add all the numbers together, and all the variables
6x-(3x+12)-3=0
We get rid of parentheses
6x-3x-12-3=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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