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7x-9=19-7x
We move all terms to the left:
7x-9-(19-7x)=0
We add all the numbers together, and all the variables
7x-(-7x+19)-9=0
We get rid of parentheses
7x+7x-19-9=0
We add all the numbers together, and all the variables
14x-28=0
We move all terms containing x to the left, all other terms to the right
14x=28
x=28/14
x=2
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