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6+12x+3=7x+30+6x
We move all terms to the left:
6+12x+3-(7x+30+6x)=0
We add all the numbers together, and all the variables
12x-(13x+30)+6+3=0
We add all the numbers together, and all the variables
12x-(13x+30)+9=0
We get rid of parentheses
12x-13x-30+9=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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