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14x+14=-28+-7x
We move all terms to the left:
14x+14-(-28+-7x)=0
We add all the numbers together, and all the variables
14x-(-7x)+14=0
We get rid of parentheses
14x+7x+14=0
We add all the numbers together, and all the variables
21x+14=0
We move all terms containing x to the left, all other terms to the right
21x=-14
x=-14/21
x=-2/3
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