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6x+12+7x=5+x+7
We move all terms to the left:
6x+12+7x-(5+x+7)=0
We add all the numbers together, and all the variables
6x+7x-(x+12)+12=0
We add all the numbers together, and all the variables
13x-(x+12)+12=0
We get rid of parentheses
13x-x-12+12=0
We add all the numbers together, and all the variables
12x=0
x=0/12
x=0
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