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12x+30=3x+39
We move all terms to the left:
12x+30-(3x+39)=0
We get rid of parentheses
12x-3x-39+30=0
We add all the numbers together, and all the variables
9x-9=0
We move all terms containing x to the left, all other terms to the right
9x=9
x=9/9
x=1
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